course in draughts exercises 3.8

8/12/2019 Course in Draughts Exercises 3.8

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Scrum T. Goedemoed 2012

White plays and wins !


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The Monkey shot (drawn by Sylvia Edelenbos)


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This is the seventh and conclusive part ofA Course in draughts.It contains a huge amount of exercises topractice the lessons from A Course of draughtspart 3. This book contains a lot of extrainformation, especially about the endgame andstrategy. A lot of research has been donebefore writing these sections. I used computerprograms Truus and Kingsrow to analysepositions and Turbo Dambase to find positionsfrom games. .The book is corrected by Martijn van der Klis,who has done a great job again.

This book can be used for self-study foradvanced players.This book can also be used by draughtsteachers, who need exercises for the trainingsthey give.I hope many draughts players and draughtsteachers will find the exercises in this bookuseful.There are 7 chapters, like in ACID 3. A seriesof compositions completes the lessons. Iselected compositions from (among others) DeProblemist, a magazine on draughtscompositions. Hermelink is my favourite

composer, so most compositions are of thisbrilliant Dutch composer.You can practise by playing online onplaydraughts (see link at the right).Enjoy the game!

Tjalling Goedemoed,

Leeuwarden, March 2013

S1.Using tactics as a weapon 4

S2.The opening of the game 30

S3. Strategy 46

S4. The thinking process 135

S5.The endgame 164

S6. Finishing of the game 221

S7.Compositions 248

Sources:

Trainingsmateriaal T. Goedemoed

Turbo Dambase Klaas Bor

Truus (anlaysing program) Stef Keetman

Kingsrow (analysing program) Grard Taille

K&K Klassiek

J. Krajenbrink & L.J. Koops

K & K Toppers: Piet Roozenburg

Het eindspel J.F. Moser

Blankenaar verzameld werk K.W. Kruijswijk

Materiaal CJT NikhilaMateriaal CJT T. Goedemoed

DamMentor T. Goedemoed

De Problemist Kring voor Damproblematiek

Play draughts online!www.playdraughts.com

Youtube channel on draughts:http://www.youtube.com/user/Akashian123
http://www.playdraughts.com/http://www.playdraughts.com/http://www.youtube.com/user/Akashian123http://www.youtube.com/user/Akashian123http://www.youtube.com/user/Akashian123http://www.playdraughts.com/


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S1. Using tactics as a weapon

4

Game played in at the Thailand draughtstournament between a Chinese (l) and a

Mongolian player

As mentioned before, tactics play a crucial rolein the game of draughts. To be able to performa strategy successfully one has to judge thetactical features of positions correctly. Thischapter gives clues as to when to watch fortactics even more sharply. Making theexercises will help you recognize tacticalpatterns faster in your own games.

Watch the clock for the time you should use fora test!


Attacking pieces

Weaknesses

The track to king

The impossible move

Sacrifices

Forcings

Kings involved

Calculation

Extra exercises

Tactical games


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5

Attacking pieces

1

2

3

4 Black

Use 20 minutes

5

6 Black

7 Black

8


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6

Weaknesses

1

2 Black

3

4

5

6

7

8 Black


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7

The track to king

1

2 Black

3 Black

4 Black

Use 25 minutes

5

6 Black

7 Black

8


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8

The impossible move

1

2

3

4 Black

Try to find the right move for white!

5

6

7

8 Black


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9

The inmpossible movecalculation

F. Hermelink

This is a brilliant composition of the famousDutch composer Frans Hermelink.

White forces a win playing the impossiblemove 1.36-31!! Black can answer this move inseveral ways, but white performs a shot ateach reply.

1.36-31!!

1) 1...21-27 2.32x21 16x36 3.29-24 19x304.40-34 30x39 5.26-21 17x26 6.28x19 14x237.38-32 39x28 8.37-31 36x38 9.42x15Draw the position in the empty diagram!

2) 1...3-8 2.31-27 22x31 3.44-39 35x44 4.28-

23 19x28 5.33x2 44x24 6.26x17 12x217.37x17

3) 1...19-24 2.29x20 14x25 3.31-27 22x314.28-22 17x39 5.26x19 31-36 6.44x33 35x447.50x39

4) The nicest shot is performed after 1...7-112.31-27 22x31 3.29-24 19x30 4.40-34 30x395.48-43 39x48 6.28-22 17x39 7.26x19 14x238.37x26 48x28 9.44x15

Draughts player Karlijn Overes


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10

Sacrifices

1

2 32-28?

3

4

5

6

7

8 Forcing


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11

Forcings

1

2

3 Black

4

5

6

7 Black

8 30-24?


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12

Kings involved

1 Black

2 Black

3

4 Black

Look for a forcing or shot!

5 Black

6 Black

7

8 Black


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13

Calculation

1.J. Lemmen

1.37-31 26x48 2.47-41 36x473.27-22 18x27 4.32x21 23x435.21-16 47x40 6.16x29 43x23

7.45x34 48x30 8.35x2 23-299.2-30 29-33 10.30-24 33-3911.25-20

2. A. Kuyken

1.29-24 20x29 2.27-21 18x493.21x1 49x24 4.39-33 23x415.34x23 19x39 6.1-6 26x37

7.6x36

3. H. Spanjer

1.35-30 27x40 2.30x19 13x243.28-22 17x30 4.45x3 24x33

5.26x17 12x21 6.3x38 21-277.38x21 16x27 8.42-37

1

2

3


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14

Extra exercises

1

B. AalbertsK. Machtelink

A) White to move. Why does he have to look

for a shot?

B) White can take a kingshot in two ways.Which one is the most convincing shot?

2

H. de WittK. Toet

White could have taken a shot, but he didntperform it.

A) How does the shot go?

B) Can you imagine why white didnt spot theshot?

3

M. BorghettiM. Kroesbergen

A) Describe the weaknesses in blacks

position.

B) How did white take advantage fromthis?

4

Mac. NDiaye A. Silva

Black goes to an endgame in which he hastactical means to win the game.

1...18-22! 2.39-34

White should have defended with 2.30-25. Thepiece on will only help black.

2...24-29! 3.33x13 22x42 4.13-8 42-47


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15

Because of whites piece on white cantgo to king-square 2!

A) How is 5.8-3 punished?

5.30-24 47x20! 6.8-2 20-15!

White has no good moves left.

B) How did black punish the played move 7.2-30?

5

I. Trofimov

In this modern position with mutual outpostsblack has just played 14-19.

A) What clue does white have to look forforcing?

B) How did white force a win?

6

T. GoedemoedB. Eggens

White recognized a combinational pattern from

a KolkDerkx game. How did he introduce thethreat of a shot that black cant parry anymore?

7

White can force a tactical freeze out. The order

of moves is important to prevent black fromescaping with a sacrifice. Find out how whitewins!


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16

8

T. AeikemaG. van Dijk

Blacks position is superior. His own edgepiece at is strong, while the edge pieceon can be tactically exploited.

A) How is 1.40-34 punished?

B) How does black meet 1.27-22?

C) Why is 1.39-34 not good?

1.36-31 13-18

D) Whats the name of the shot that followsafter 2.39-34 ?

2.42-37

E) Which breakthrough shot decided thegame?

9

R. KeurentjesK.H. Leijenaar

White played the sharp Samba-swing:31.23-19?!

Black cant play 4-10 now, because of akingshot.

A) How does this shot go?

B) Black has a very surprising defence using asacrifice. Can you spot it?

10

Black to move

A) Describe the position in words. Why shouldblack to move look for tactics?

B) Look for a forcing!

11

J. DekimpeP. Casaril

How did the young Belgian player force akingshot?


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17

Tactical games

The game R. HeusdensG. Jansen (from theDutch championship 2001) was verycomplicated with many tactical possibilities.We show the game and will analyse the crucial

position.

R. HeusdensG. JansenDutch championship 2001

1.32-28 17-22 2.28x17 11x22 3.37-32 6-114.41-37 12-17 5.46-41 8-12 6.32-28 16-21

7.31-26 21-27 8.36-31 27x36 9.26-21 17x2610.28x6 20-24 11.37-32 14-20 12.32-27 10-1413.34-30 2-8 14.30-25 18-23 15.42-37 24-29

16.33x24 20x29 17.27-22 12-18 18.39-3318x27 19.33x24 19x30 20.25x34 13-19

21.44-39 8-13 22.50-44 27-31 23.48-42 7-12

24.38-33 15-20 25.43-38 5-10 26.49-43 10-1527.34-30 12-18 28.30-25 3-8 29.40-34 8-12

30.45-40 12-17 31.34-30 18-22 32.38-32

R. HeusdensG. Jansen

The position looks exotic with the edge pieceson . Black was to move and wentwrong, playing 32...13-18?

A) How could white have punished this move?

Black can try to make a shot himself, playing32...4-10, hoping for 33.32-28? 23x3234.37x28.

B) Show the shot (a Mountain shot) black cantake now.

32...4-10 isnt a strong move, because it spoilsblacks position. His left wing is weakened bythe dangling piece on . So lets look at32...20-24.

C) 32...20-24 33.43-38 can be punished byblack. How does the shot go?

White should meet 32...20-24 with 33.32-2823x32 34.37x28. After 13-18 white shouldntplay 35.40-34?

D) Which kingshot does black perform in thiscase?

J. ErmakowA. ChizhovRussian championship 1987

1.33-29 17-22 2.39-33 11-17 3.44-39 6-114.50-44 1-6 5.31-26 16-21 6.32-28 19-23

7.28x19 14x23 8.35-30 10-14 9.30-24

This is the famous Keller-opening. Black has tomake a choice from several goodcontinuations:

- 9...21-27 The orthodox continuation- 9...23-28 The main line- 9...22-28x28x22 Revoenets-variation- 9...5-10 The modern continuation

Black chose 9...23-28 in this game. The mainline is 10.40-35 20-25 11.24-20 15x2412.29x20, but white chooses a differentvariation.

9...23-28 10.37-31 5-10 11.42-37 20-2512.24-20 15x24 13.29x20 10-15 14.34-2915x24 15.29x20 14-19 16.20-15 25-30!

The piece at causes white more troubleto control the right wing.

17.40-34 30-35 18.45-40 18-23 19.38-32 11-1620.43-38


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18

20...12-18?!

Allowing his opponent to make a kingshot. Theimmediate 21.34-29 would be punishedthough.

A) Look for the counter-shot after 21.34-3923x45 22.32x1

21.15-10 4x15 22.34-29 23x45 23.32x1 19-2424.48-43

B) Why doesnt black catch the white king with24...2-7?

24...45-50 25.1-45

C) Look for the shot that black performed!The white king will disappear and the blackking will capture four pieces. Draw theremaining position in the empty diagram!

Black finished off the game using his king in anexcellent way:

32.24-20 13-18 33.20-15 9-14 34.43-38 18-2335.41-37 23-29 36.37-32 6-11 37.36-31 8-1338.32-27 11-17 39.46-41 2-7 40.41-36 13-8

41.31-26 7-11 42.27-21 8-12 43.21-16 12-744.49-43 29-34 White resigned.

J. WielaardT. Sijbrands

Simultaneous game 2004

1.33-29 19-23 2.35-30 20-25 3.40-35 14-204.38-33 16-21 5.42-38 21-26 6.47-42 10-14

7.32-28 23x32 8.37x28 26x37 9.41x32 14-1910.30-24 19x30 11.35x24 17-21 12.46-41 11-16 13.41-37 6-11 14.45-40 11-17 15.37-31 21-26 16.50-45 26x37 17.32x41 16-21 18.41-37

7-11 19.37-32 11-16 20.42-37 18-22 21.28-2313-18 22.32-28 21-26 23.38-32 16-21 24.43-381-6 25.48-43 6-11 26.40-35 11-16

A sharp attacking position has emerged on theboard. White has to develop his attack, so nextmove is logical.

27.34-30 25x34 28.39x30

Black could play 28...21-27 29.32x21 16x27after which white has to pull back his attackwith 38-32x42x38 (or 37-31 first and then 38-

32x31), with an advantage, but black wantsmore and uses the tactical possibilities thisposition gives.


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28...4-10?!

White has to look at 3 moves: 30-25, 44-39and 37-31. We look at all three candidatemoves.

29.37-31 26x37 30.32x41 21-26 31.44-39 22-27

A) How does black force gaining a piece after32.45-40?

32.38-32 27x38 33.43x32 20-25 34.49-43?25x34 35.39x30

Draw the position in the empty diagram.

B) Which strong move forces a win now?

In the game white played 29.30-25?

C) Why is this a dangerous move? Use onlywords to explain why.

Black performed a nice forcing:

29...21-27 30.25x14 10x30 31.35x24 9-1432.32x21 16x27

D) How is 33.33.37-31 26x37 34.38-32 27x3835.43x41 punished?

33.38-32.27x38 34.43x32

E) Which kingshot did black perform now?

F) After this shot white resigned. Would you do

that too?

It turns out that 29.30-25 isnt good. The mostlogical move seems 29.44-39, closing the gapat . We show only one line:

29.44-39 9-13 30.30-25 21-27 31.25x14 10x3032.35x24 5-10 33.32x21 16x27 34.38-3227x38 35.43x32 10-14 36.45-40

G) Can you predict blacks next move?

T. SijbrandsG. Beerepoot1980

1.33-29 17-22 2.39-33 11-17 3.44-39 6-114.50-44 1-6 5.32-28 16-21 6.31-26 19-23

7.28x19 14x23 8.35-30 10-14 9.30-24 23-28

Black chooses the main line in the Keller-opening.

10.40-35 20-25 11.24-20 15x24 12.29x20 14-19 13.20-15 5-10 14.37-31 10-14 15.34-29 19-

23 16.44-40 23x34 17.40x29

This is the so-called Boom-opening, namedafter Gerrit Boom from the Netherlands, whowon a nice game against a young AlexanderBaliakin with it. Boom is Dutch for tree. Therealso is a so-called neo-Boom-variation. Wecould call these variations the old and the newTree in English...The New Tree is shown in the next game.

BoomBaliakin (1980)was:15...21-27 16.42-37 19-23 17.44-40 23x34

18.40x29 11-16 19.45-40 13-19 20.40-34 9-1321.37-32 28x37 22.41x21 16x27 23.38-32


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20

27x38 24.43x32 3-9 25.35-30 19-23 26.31-2722x31 27.36x27 14-19 28.46-41 7-11 29.48-4217-22 30.41-36 22x31 31.36x27 12-17 32.47-41 2-7 33.41-36 8-12 34.49-44 17-22 35.30-2422x31 36.36x27 19x30 37.32-28 23x2138.26x19 18-22 39.19-14 9x20 40.15x35 7-12

41.29-23 22-27 42.42-37 11-17 43.34-29 17-2244.37-32 27x38 45.33x42 6-11 46.39-33 11-1647.42-37 16-21 48.44-39 21-26 49.39-34 12-1750.23-19 22-27 51.37-32 27x38 52.33x42 4-953.42-37 17-21 54.29-23 21-27 55.23-18 27-3156.19-13 31x42 57.13x4 42-47 58.18-12 2-0

Lets continue Sijbrands Beerepoot:

17...14-19 18.45-40 19-23 19.40-34 9-1420.41-37 11-16 21.46-41 7-11

We will have a look at an explosive line:

21...21-27 22.38-32 27x38 23.43x32 17-2124.26x17 12x21 25.34-30 25x43 26.48x3923x43 27.32x1 43-48

Now whites best move is 28.31-26with anadvantage after 22-27 29.26x17 16-2130.17x26 27-32 31.37x28 48x19 32.47-4219x46 33.1-45 +/-.

A) Why shouldnt white play 28.42-38?

22.31-27 21x32 23.38x27 22x31 24.36x27 3-9

25.33x22 17x28 26.41-36 12-17 27.37-31 17-22 28.42-38 11-17 29.29-24!

White finished the game with a great shot.Black has already a lost position.

29...14-19 30.34-29!

B) How does white continue after 30...23x34?

30...19x3031.35x24 23x34 32.39x30 25x3433.26-21 17x37 34.38-32 22x31 35.32x14 37-

41 36.36x27 41-46

C) How did the shot continue?

H. MeijerP. OudshoornBijlmer 2001

1.33-29 17-22 2.39-33 11-17 3.44-39 6-114.50-44 1-6 5.31-26 16-21 6.32-28 19-23

7.28x19 14x23 8.35-30 10-14 9.30-24 23-2810.40-35 20-25 11.24-20 15x24 12.29x20

14-19 13.20-15 11-16

Before it is made impossible by the 37-31move, white plays 11-16 & 7-11. His intentionis not to play 21-27 but go to later! Thisline is the beginning of the New Tree.

14.37-31 7-11 15.44-40 5-10 16.34-30 25x3417.40x29 19-23 18.29-24 9-14 19.35-30 23-29

20.30-25 29x20 21.15x24 10-15 22.45-40

A) Why cant black play 22...4-9?

Black takes an outpost at with afascinating fight. This is the point of the NewTree.

22...28-32 23.38x27 21x32 24.33-29 4-925.39-34 22-27 26.31x22 17x28 27.34-30 11-17 28.40-35 2-7 29.36-31 7-11 30.42-37 18-2231.49-44 13-18 32.44-39 8-13 33.39-34 14-20

34.25x14 9x20 35.43-39


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B) With which kind of shot is 35...20-25?punished?

35...3-8

White could have forced a win now.

C) Does he have to play 47-42 or 48-42?Explain why.

L. TsipesE. Tachma

1979

1.33-29 17-22 2.39-33 11-17 3.44-39 6-114.50-44 1-6 5.31-26 16-21 6.32-28 19-23

7.28x19 14x23 8.35-30 10-14 9.30-24 5-10

The modern line in the Keller opening.

10.37-31 20-25 11.24-20 15x24 12.29x20

The sharpest line from here is 12...11-1613.20-15 7-11 14.41-37 14-19 15.40-35 10-1416.44-40 2-7 17.33-29 19-24 18.29x20 14-1919.35-30 25x14 20.40-35 22-27 21.31x2217x28 22.26x17 12x21. The game continued:

12...14-19 13.20-15

Usually 13...10-14 is played here followed by

22-27 like in the game.13...10-14 cant be met by 14.33-28 because is vulnerable with an edge piece at :

14.33-28? 22x33 15.39x28 23x32 16.38x1614-20! 17.15x24 19x50 B+.

White shouldnt play 14.33-29? either.

A) How does black force a win now?

1322-27 14.31x22 17x28 15.33x22 18x2716.26x17 12x21 17.41-37 8-12 18.34-30!

25x34 19.40x18 13x22 20.37-31

The point of this play is that black cant attack21-26 which was played in the game.

B) Which kingshot did white perform after20...21-26?

The point of whites play is even deeper. After20...2-8 21.31-26 22-28 22.26x17 11x22, whitealso has a kingshot.

C) How does this kingshot go?

A. BaljakinA. RatsSalou 2010

1.33-29 17-22 2.39-33 11-17 3.44-39 6-114.50-44 1-6 5.31-26 16-21 6.32-28 19-23

7.28x19 14x23 8.35-30 10-14 9.30-24 5-1010.37-31 20-25 11.24-20 15x24 12.29x2022-27 13.31x22 17x28 14.26x17 12x2115.33x22 18x27 16.20-15 8-12 17.40-35

White could have played 17.41-37 hoping for14-19 18.34-30 etc. as in the previous game.

17...14-19 18.34-30 25x34 19.39x30 10-1420.44-39 12-18 21.45-40 7-12 22.40-34 11-1723.41-37 6-11 24.38-33 21-26 25.33-29 2-7

26.39-33 17-21 27.43-39 11-16 28.47-41


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This is a key position in this opening that hasemerged on the board many times.The main line is 28...18-22 29.29x18 12x2330.33-29 13-18 31.37-31 26x37 32.42x31.The best move for black is 32...23-28! Like inWiersmaChizhov (Wch match 1994).

WiersmaC. van der Schaaf was:32...9-13 33.39-33

A) Why shouldnt black play 33...21-26 now?

28...3-8 29.30-25 18-22 30.29x18 12x2331.33-29 8-12

The continuation 31...13-18 32.37-31 26x3733.42x31 21-26? allows white to make a shot.

B) How does this shot go?

32.29x18 12x23 33.34-30 7-12?

Black should have played 13-18.

34.39-33 12-18

C) Black cant play 34...13-18 anymore. Whynot?

35.49-43

Black hasnt got a good move left.

D) How does white meet 35...27-31 36.36x2722x31 winning in a positional way?

E) Black played 23-28. How did white finish offthe game?

A. ScholmaP. Hoopman1999

1.32-28 20-25 2.37-32 15-20 3.41-37 10-154.34-30 25x34 5.39x30 17-21 6.44-39 21-267.40-34 20-25 8.45-40 11-17 9.50-45 17-21

10.30-24 19x30 11.35x24 7-11 12.31-27 14-2013.49-44 20x29 14.33x24 12-17 15.38-33 8-1216.34-29 3-8 17.28-23 9-14 18.42-38 14-20

19.47-42 17-22 20.46-41 22x31 21.36x27 1-722.41-36 4-10 23.40-35 11-17 24.33-28 7-11

25.38-33

Black should have played 25...10-14! creatingthe 25-30 threat, while taking advantage ofwhites weaknesses, especially the gap on.

A) Which great shot follows after 26.35-30

25x34 27.39x30 ?

B) How is 26.39-34? punished?

Whites best defence is sacrificing a piece, withpositional compensation:26.37-31 26x37 27.42x31 25-30 28.24-1913x24 29.31-26 8-13?!

C) Why is 30.28-22? a mistake now?

In the game black made a huge mistakeplaying 25... 2-7??

D) How did white win?


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Solutions

Attacking pieces

1) 1.27-22! 25x34 2.44-40 18x27 3.40x1813x22 4.28x26 W+

2) A. BoxumR. van MarleWhite could have won making a shot:1.40-35!22x44 2.23-19 14x23 3.29x9 3x14 4.24-2015x24 5.43-39 44x33 6.38x9 W+

3) 1.28-22 25x34 2.40x20 14x25 3.27-2126x39 4.38-33 39x28 5.32x5 W+

4) G. KolkW. Sipma1...13-18! 2.22x15 17-22 3.28x8 2x13 4.35x24

13-19 5.24x13 9x49 B+

5) A. de HoonP. KortWhite could have won playing 1.49-43! 18x273.36-31 27x47 4.38-33 47x35 5.33x24 35x196.28-22 17x28 7.32x1

6) N. HoekmanT. Kooistra1.37-32? 10-14! 2.32x12 7x18 3.28x17 24-294.34x12 25x34 5.39x30 13-18 6.12x23 19x46B+

7) J. HooijbergB. Provoost

1.37-31? 14-20! 2.31x22 17x39 3.34x4323x34 4.25x23 34x25

8) G. Mantel1.35-30!? 20-24? 2.33-28! 24x35 3.37-3126x46 4.39-34 22x33 5.38x29 46x28 6.29-2419x39 7.44x2

Weaknesses

1) O. SadovskajaD. FedorovichWhite could have taken advantage from the

gap at making a nice kingshot:1.28-23!18x38 2.32x43 21x41 3.36x47 26x37 4.47-4117x28 5.41x3W+

2) R. KoopmanschapE. van MuijenMany gaps in whites position give white theopportunity to make a shot: 1...24-29! 2.34x2313-18 3.23x12 22-27 4.31x22 14-20 5.25x2311-16 6.22x11 16x36 piece breakingthrough later.

3)Black has several gaps in his position.1.28-23! 19x28(1...18x29 2.35-30 24x44

3.33x24 44x42 4.24-20 15x24 5.31-26 42x316.36x29 W+)2.32x23 18x29 3.35-30 24x44

4.33x24 44x42 5.24-20 15x24 6.31-26 42x317.36x29 W+

4) The opened square should alarmwhite to look for a shot. 1.27-22! 18x27 2.33-29 24x33 3.38x18 27x49 4.34-30 13x22 5.30-

24 20x29 6.40-35 49x40 7.45x3 W+

5) R. KoopmanschapR. HeusdensWhite could have used the gaps in blacksposition by making a shot: 1.39-34! 30x502.31-26 50x17 3.27-22 17x31 4.26x17 11x225.36x18W+

6) W. LeijenaarE. VatoetinPiece is dangling, giving white theopportunity to make a breakthrough shot to. 1.28-23! 19x28 2.33x22 24x42 3.22-1812x23 4.34-30 25x34 5.40x18 13x22 6.43-38

42x33 7.39x6 W+

7) Square isnt covered. White makes aking on that square. 1.28-22 17x28 2.25-2014x34 3.38-33 29x49 4.40x29 23x34 5.32x349x21 6.26x17 12x21 7.3x40 W+

8) M. van IJzendoornK. van AmerongenBlack could have won making a shot, usingwhites weak construction with gaps at . 1...23-28! 2.33x2 18-23 3.29x7 8-124.7x18 13x31 5.26x37 14-20 6.2x24 20x49 B+

The track to k ing

1)1.26-21! 17x26 2.37-31 26x28 3.34-2924x33 4.39-34 30x39 5.27-21 (the immediate42-38 will also win) 16x27 6.42-38 33x427.44x2 35x44 8.2x7

2) C. PippelS. Rijgersberg1...4-10! 2.32x21 12-18 3.21x1(3.21x23 25-30 4.28x6 30x46 B+)3...11-164.1x23 25-30 5.24x35 13-19 6.28x17 19x46B+

3) 121-27! 2.32x12 13-18 3.12x23 19x284.33x22 24-30 5.35x24 14-19 6.24x13 9x47B+

4) 1...13-19! 2.24x2 23-29 3.33x24 14-194.24x22 1-7 5.2x11 6x50 B+

5) H. Jansen1.33-29! 24x33 2.30-24 19x39 3.27-22 18x384.35-30 25x34 5.40x7 2x11 6.37-32 38x277.48-43 39x37 8.41x5 W+

6) K. van AmerongenS. den Hollander


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Black could have performed a kingshot. 1...26-31! 2.37x26 20-24 3.30x19 8-13 4.19x1711x31 5.23x12 6-11 6.26x37 11-17 7.12x2116x47=

7) 1...13-18 2.22x24 20x29 3.34x23 26-31

4.37x17 11x33 5.38x29 25-30 6.35x24 15-207.24x15 4-10 8.15x13 8x50 B+

8) 1.36-31 27x36 2.25-20 14x25 3.34-3025x34 4.39x19 28x50 5.26-21 13x24 6.21-1712x21 7.38-33 50x28 8.47-42 36x38 9.43x5W+

The imposs ib le move

1) W. OkrogelnikC. MartensWhite could have won by playing1.30-25!18-

22 2.25x14 22x44 3.48-43 19x10 4.43-3944x33 5.38x7 W+

2) P. Bouma - Tj. v.d. Bosch1.39-34!! 24-291...9-14 2.34-29 23x34 3.40x29 W+2.33x24 19x48 3.28x19 13x24 4.27-21 16x275.31x4 48x31 6.26x37 W+

3) W. Sipma1.30-24! 20x29 2.31-26!! 11-17[ 2...1-63.26x17 11x31 4.37x26 28x39 5.44x2 W+ ]3.27-22[ Or 3.38-33 28x48 4.27-22 18x385.42x2 48x31 6.26x37 ]3...18x27 4.38-3328x48 5.44-40 27x38 6.42x2 48x31 7.26x37

4) B. ProvoostR. Boomstra1...23-28!! 2.42-37(2.31-26 22x31 3.33x2 31-36 4.2x30 25x32 B+)2...18-23 3.27x18 23x124.33x22 12-18 5.22x2 16-21 6.2x30 25x41 B+

5) W. SipmaT. v.d. Broek1.29-24! 23-29(1...14-19 2.38-32 19x30 3.32-28 23x32 4.31-27 22x31 5.36x7 W+, 1...23-282.25-20 14x25 3.24-19 13x24 4.31-27 W+)

2.34x23 18x20 3.31-27 22x31 4.36x18 13x22

W+1

6) 1.32-28! 2-8(1...18-23 2.27x20 23x34 3.42-38 24x15 4.33x13 W+, 1...12-17 2.28-2319x28 3.39-34 28x30 4.25x21 W+1)2.28x1712x34 3.42-37 29x38 4.40x9 13x4 5.37-3238x27 6.31x2W+

7) T. SijbrandsF. Zahnd1.33-29!! 12-18(1...12-17 2.29x18 13x35 3.27-

22 17x28 4.32x5 W+, 1...11-17 2.29x7 8-123.7x18 13x35 4.27-22 17x28 5.32x5 W+)2.29-

24 20x29 3.27-22 18x27 4.32x21 23x435.34x5 W+

8)1...17-22!! 2.47-42 (2.48-42 gives the sameshot)22x31 3.37x17 23-29 4.34x12 13-185.12x23 14-20 6.25x14 10x46 B+

Calculat ion

1

2

3

4


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Sacrif ices

1)W. de JongW. v.d. Sluis1.25-20 14x25 2.32-28 11-17 3.27-21 16x274.37-32 26x37 5.32x23 22-27(5...13-18!

6.28x17 18x29 7.33x24 8-12 8.17x8 3x12=)6.23-19 13x24 7.28-22 27x18 8.38-32 37x289.33x2 W+

2) C. v.d. Hurk1.32-28? 22-27!! 2.31x22 9-14 3.30-25(3.22-17 19-24 4.30x19 14x41 5.36x47 21-27 B+)3...19-23 4.28x19 14x23 5.25x5 21-27 6.5x2126x48 B+

3) T. Goedemoed1.24-20 15x24 2.38-32 8-12(2...28-33 3.39x2822x33 4.27-21 16x38 5.37-32 38x27 6.31x2

W+)3.32x23 18x29 4.27x9 4x13 5.39-3329x38 6.37-32 38x27 7.31x2 W+

4) V. Bulat1.24-19 13x24 2.29x9 4x13 3.23-18 13x224.37-32 27-31 5.33-28 22x42 6.48x26 W+

5) A. Scholma1.28-22! 18x36 2.39-34 8-13 3.34-29 12-184.29x9 13x4 5.47-42 36x29 6.30-24 19x307.25x1 W+

6) 1.24-19! 13x24 2.29x20 15x24 3.33-28 14-

19 4.26-21 16x38 5.39-33 38x29 6.49-4323x32 7.34x21 W+

7) Triple gambit: 1.29-23 18x29 2.27-21 16x273.28-22 27x18 4.39-34 19-23 5.33-28 23x326.34x25 W+

8) M. Bonnard1.34-29 30-35 2.32-28 17-21 3.31-26 18-224.26x17 22x11 5.25-20! 14x25 6.29-23 W+

Forcings

1) M. KroesbergenT. Dijkstra1.33-28! 10-14* 2.27-21 16x38 3.36-31 23x324.31-27 32x21 5.26x8 13x2 6.39-33 38x297.34x1 W+

2)J.T. DekkerC. van der Tak1.39-34! 24-29(1...4-10 2.34-29 23x343.40x20 10-15 4.42-38 15x24 5.28-23 19x396.38-33 39x28 7.32x1 21x32 8.37x28 W+,1...24-30 2.33-29 30x39 3.29-24 19x304.28x10 4x15 5.25x43 W+)2.33x24 19x393.28x8 2x13 4.37-31 26x28 5.48-43 39x37

6.41x1 21x32 W+

3) Y. BobkovE. Heslinga1...23-29! 2.33-28 30-34 3.39x19 29-344.40x29 7-12 5.17x8 2x42 B+

4) A. VerchovichM. van Gortel1.33-29! 18-22(1...15-20 2.28-22 17x37 3.47-

42 37x48 4.40-35 48x30 5.35x2 23x34 6.2x16W+, 1...8-12 2.38-33!(2.27-22 18x27 3.29x1619-23 4.32x12 23x43 is not clear)2...15-20

3.27-21 17x26 4.28-22 18x38 5.29x16 38x296.34x14 20x9 7.16-11 W+, 1...25-30 2.34x2523x34 3.40x29 19-23 4.28x19 18-22 5.27x188-13 6.19x8 3x34 7.32-27 W+)2.27x18 23x123.28-22 17x37 4.47-42 37x48 5.40-35 48x306.35x2 W+

5) O. DijkstraM. Janssen1.22-18! 13x22 2.28x17 21-27(2...8-13 3.17x83x12(3...13x2 4.39-34)4.32-27 21x34 5.40x9

W+, 2...12-18 3.37-31 26x28 4.33x2 21x125.35-30 24x33 6.38x7 W+)3.32x21 16x274.17-11 6x17 5.37-31 26x37 6.42x11 W+

6) F. Raman1.30-24! 19x30 2.35x24 23-29 3.27-22 18x494.40-34 49x19 5.34x12 13-19 6.33-29 6-117.12-7 11-17 8.7-1 19-23 9.29x18 2-7 10.1x2116x27 11.26-21 27x16 12.18-13 W+

7)A. MartereN. Hoekman1...8-13! Threatening to make an arch shot!2.32-27(2.42-37 24-29! 3.33x24 13-18

4.24x22 26-31! 5.28x10 31x44 6.40x49 17x467.10-5 9-14 B+)2...23x32 3.42-37 2-8!4.37x28 17-22 5.28x17 11x31 6.36x27 26x17B+

8) F. Luteyn - J.M. Ndjofang1.30-24? 11-16! 2.24x15 22-27 3.32x21 16x274.37-32 27x38 5.33x42* 18-22! 6.39-33 17-217.28x17 4-9 8.15x13 8x50 9.17x8 2x13 B+

Kings involved

1) K. ter BraakeA. Georgiev1...26-31! 2.37x26 16-21 3.26x17 18-234.28x8 4-10 5.15x4 45-50 6.4x31 50x3 B+

2) Th. v.d. HoekT. v.d. Broek1...16-21! 2.26x17(2.27x16 23-28 3.32x23 13-19 4.23x14 3x13)2...23-28 3.32x23 24-304.35x24 13-18 5.22x11 3x19(Black can alsocapture 5...3x1) B+

3) A, GeorgievR. Misans1.10-5 28-33 2.42-38 33x42 3.36-31 26x464.24-19 46x14 5.5x48 W+

4) A. GeorgievR. Boomstra


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Black could have won by playing1...17-22!! 2.26x28 13-18 3.23x12 49-35 4.24-20 35-19 5.20x9 19x14 6.36-31 14-9 7.31-269-3 B+

5) A. PlantingaE. Heslinga

1...24-30! 2.35x13 14-19 3.13x24 12-184.22x13 7-11 5.16x7 23-28 6.32x23 46x19 B+

6) C. van DusseldorpM. DeurlooBlack could have won by the shot1...36-41!2.47x27 19-23 3.28x19 18-22 4.27x18 45x13B+

7) E. ProsmanJ. v.d. PlasWhite missed1.26-21! 17x26 2.27-22 18x273.10-5 49x35 4.29-24 35x19 5.5x16W+

8) A. ChizhovD. Rusaev

Black could have won making a shot in whichboth players go to king: 114-19 2.24x4 16-21!The game was: 2...25-30 3.34x25 23x43

4.32x23 18x38 5.27x18 12x23 6.31-27 43-497.26-21 17x26 8.37-31 26x37 9.27-21 16x2710.4x1 W+ 3.27x16 25-30 4.34x25 23x435.32x23 18x38 6.4x27 43-49 7.27x43 49x46B+

Calculat ion

1

2

3

Extra exercises

1A) Black has a gap at , which often givesthe opponent the opportunity to make a shot.

White has several tracks to king, like 35 x 2 / 4and 43 x 2 / 4.

B) 1.37-31! 26x28 2.48-43!The game was 2.44-40 21x32 3.29-24 20x294.30-24 19x39 5.40-34 29x40 6.35x4 whichlooks good too, but black escaped with a drawlater.2...21x32 3.29-24 20x38 4.42x2 25x34 5.2x29

2A) 1.34-30 25x32 2.44-39 35x33 3.42-3833x42 4.48x6 W+

B) Superficially it looks like a position withouttactical possibilities. There isnt much contactbetween both players. Therefore white didnteven look for a shot.Still white can use the edge pieces for a breakthrough shot. The only clue for thisshot is spotting the 48 x 6 track.

3A) Black has a dangling piece on whichmakes his position vulnerable, not onlypositional but also tactical. White, havingstrong outposts and a piece on controlling the right wing, can use the edge

piece on to force a shot, using the 25x3track to king.

B) 39-34!introduces the strong threat 23-1947-41 34-30x39 25x3. Black cant parry thisthreat and loses.

4A) 5...23-29! 6.3x33(or another square)47x45 B+

B) 7....14-19! 8.30x21 7-12 9.16x29 15x16 B+

5A) Black has no base pieces on , so

white should look for kingshots removingpieces at .


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B) 1.47-42! 19x30 2.35x24is threatening 34-30! and pieces are removed:Either 34-30 25x34 39x30 24-19 13x24 33-28etc. or 34-30 23x34 24-19 |& 33-28 W+follows.2...23-28 is met by the kingshot 3.24-19 13x24

4.29x20 25x14 5.37-32 28x37 6.33-28 22x337.31x4 W+.

6)1.34-29! 2-81...2-7 gives the same shot.1...19-23 is met by 2.24-19 W+.2.38-32!27x38 3.24-20 15x24 4.29x20 38x29 5.30-2419x30 6.25x3 14x25 7.3x14 W+

7) T. GoedemoedD. Staal (analysis rapidgame)1.48-421.27-21? 7-12 2.48-42(2.21-16 4-10)2...29-34! 3.30x39 18-22 is only a draw.

1.43-38! Is good too: 7-12(1...17-22 2.28x1729-33 3.38x29 23x25 4.26-21 7-12 5.17x813x2 6.21-17 with a breakthrough for white.)

2.45-40 4-10 3.48-42 10-15 4.27-211...4-91...4-10 2.27-21 7-12 3.43-38 10-154.21-162.27-21 7-12 3.43-38 Black cant play 18-22(21-16 & 30-24 W+) and he doesnt have agood sacrifice either.

8A) 1.40-34 24-30 2.35x24 20x40 3.45x34 25-30 4.34x25 23-29 5.33x24 19x30 6.25x34 17-21 7.26x17 11x44 B+

B)1.27-22 24-29 2.33x24 19x30 3.28x817x48 4.35x24 48x2 B+

C) 1.39-34 24-30 2.35x24 19x39 3.28x8 39x484.8-2 17-21 5.26x17 11x31 6.36x27 48-37results in an endgame with two pieces less forwhite.

D) 41.39-34?is met by the arch shot 4124-29! 42.33x22 20-24 43.28x30 17x48 B+

E) 2 ...24-29! 3.33x22 3-8 4.28x19 17x28

5.32x23 20-24 6.19x30 25x41 B+9A) 1.29-23 20x18 2.40-35 13x24 3.36-3126x37 4.38-32 37x28 5.33x4 W+

B) 1...11-16! 2.19-14 17-22!! 3.14x3 12-17!4.3x21 16x27 and in spite of having two pieceslees, black has the better position! Investigatethis position yourself!

10A) Black has an attacking position withoutposts on . Whites positioncontains some weaknesses however: Gaps at

and and his left wing isntdeveloped. Black has many formations to play

against the attack. Hitting on will createanother gap, after which the track to king 8 x50 becomes visible. The logical forcing move is18-22 therefore.

B) 1... 18-22! If white plays 45-40 or 43-38

black takes a kingshot after the exchangeplaying 12-18 16x27 13-18 and 8x50 +.2.31-27 is met by 22x33 3.39x28 26-31!4.37x26 17-22 5.27x9 8-13 6.9x18 16-217.26x8 2x33 8.29x38 20x49 B+

11) White played the impossible move 1.33-28!! 14-191...5-10 2.28x19 13x35 3.37-31 26x28 4.38-3227x38 5.42x4 W+2.25x14 19x102...9x20 3.37-31 26x37 4.42x11 16x7 5.29-2420x29 6.32-27 21x32 7.38x27 23x21 8.34x1

W+3.28x19 13x35 4.37-31 26x28 5.38-32 27x386.42x4 W+

Tactical games

R. HeusdensG. Jansen

A) 33.42-38! 31x42 34.30-24 19x30 35.35x2420x29 36.33x24 42x33 37.39x10 W+

B) 32...4-10?! 33.32-28? 23x32 34.37x28 19-

24! 35.30x8 9-13 36.8x19 14x32 37.25x5 31-37 38.42x31 26x46 39.5x37 46x45 B+

C) 33...24-29 34.33x24 14-20 35.25x3 22-2836.3x21 26x17 37.37x26 28x48 B+

D) 35...31-37! 36.41x32 22-27 37.32x23 36-4138.47x36 24-29 39.33x13 9x47 B+

J. ErmakovA, Chizhov

A) 21.34-29 23x45 22.32x1 4-10! 23.15x4 9-14 24.4x27 21x34 25.1x40 45x34and after

26.33-29 34x23whites position is terrible. Hisdivision of pieces is out of balance.

B) 24...2-7? 25.1x20 15x24 26.44-40 35x4427.49x40 45x34 28.39x19 13x24 W+1

C) 45...8-12 26.45x1 22-27 27.31x11 16x728.1x20 15x24 29.26x17 35-40 30.44x35 24-29 31.33x24 50x8


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J. WielaardT. Sijbrands

A) 32...17-21 33.40-34 12-17 34.23x12 27-3135.36x27 21x23 36.12x21 26x17 37.29x1820x40 38.35x44 8-13 B+1

B)

White has many gaps: are allopened. 35...18-22!is threatening with thekingshot 17-21 15-20, while 36.32-27 22x3137.36x27 is punished by 3716-21! 38.27x1617-22 39.28x17 12x21 40.16x27 15-2041.24x13 8x48 B+. Black is also threatening toplay 12-18.36.23-19 is met by 9-14! 37.19-13 (no othermove) 8x19 38.24x13 3-9! 39.13x4 22-27 etc.with a king at .

C) White gives his opponent a free move, while

having a weakness at .

D) 33.37-31 26x37 34.38-32 27x38 35.43x4117-21 36.28x26 14-19 37.24x22 12-1838.23x12 8x50 B+

E) 3422-27 35.32x21 17-22 36.28x17 14-1937.24x22 8-13 38.17x19 26x50

F) The remaining position may be lost forwhite, but it is interesting enough to play on.Blacks king cost two pieces, so it is still nottrivial to win. Resigning now already is much

too early.

G) Black takes a chain-lock playing 36...13-1937.24x13 8x19 (preventing 39-34 because of

17-21 B+) with attractive play for black.

T. SijbrandsG. Beerepoot

A) 28.42-38? 22-28! 29.33x22 4-10 30.15x421-27 31.4x18 2-7 32.1x12 8x28 33.31x3348x4 B+

B) 30...23x34 31.39x30 25x34 32.26-21 17x3733.38-32 19x30 34.32x14 22x31 35.36x27 2-736.35x24 34-40 37.14-10 40-45 38.10-5 45-5039.5x46 W+2

C) 37.24-19! 13x24 38.14-9 4x13 39.47-4146x21 40.43-38 21x43 41.48x8 2x13 42.15-10W+

H. MeijerP. Oudshoorn

A) 23.25-20 14x25 24.24-19 13x24 25.31-27with king at .

B) A pingpong shot with 36.39-33! 28x3937.34x43 25x23 38.37x8 W+

C) 36.47-42! (The game was 48-42?)20-2536...17-21 26x17 12x21 is met by 31-27 22x3137x17 11x22 30-25 W+36...16-21 loses due to37.31-27 22x31 38.41-36 32x41 39.36x7 12x140.46x37 W+1) 37.48-43 17-2138.26x17

12x21 39.39-33! 28x48 40.37x26 48x3741.41x32 W+

L. TsipesE. Tachman

A) 14...22-28!Threatening 28-33, while 15.38-32 28x3716.41x32 is met by 17-22 17.26x28 14-2018.15x24 19x30 19.28x19 13x33 20.39x2830x50 B+15.38-33 14-20 16.15x24 19x30 17.33x2217x28 18.26x17 11x22with the lethal threat of

28-33 B+.

B) 20...21-26 21.38-32 26x28 22.36-31 27x3623.47-41 36x38 24.43x5 W+

C) 23.39-33 28x50 24.38-33 50x28 25.36-3127x36 26.47-41 36x38 27.43x5 W+

A. BaliakinA. Rats

A) 33...21-26? 34.30-24! 19x28 35.35-3023x25 36.48-43 26x37 37.41x1 ++/-

B) 34.35-30 26x37 35.41x21 16x27 36.36-3127x36 37.46-41 36x47 38.29-24 47x2039.15x11 W+


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C) 35.33-28! W+

D) After 35...27-31 36.36x27 22x31 37.41-36!black hasnt got a good temp let to make anexchange. He must play 37...23-28 38.33x22

18x27and white can profit from the lock.

E) 36.25-20 14x34 37.43-38 28x39 38.38-3339x28 39.37-31 26x37 40.41x3 W+

P. HoopmanA. Scholma

A) 26.35-30? 25x34 27.39x30 13-19! 28.24x2212-18 29.23x3 26-31 30.37x26 20-25 31.3x2025x23 32.28x19 17x50 33.26x17 11x3134.36x27 15x13B+

B) 26.39-34? 17-22! 27.28x17 11x31 28.36x27

26-31 29.37x17 12x21 30.23x3 5-10 31.3x2616-21 32.26x19 14x23 33.29x18 20x47 B+

C) 30.28-22? 17x37 31.26x10 15x4! 32.23x122-8! 33.12x3 37-41 34.3x34 41-47 35.29x2047x21 B+

D) 26.24-19 13x24 27.28-22 17x19 28.37-3126x28 29.33x2W+


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S2. The opening of the game

30

We will elaborate on openings discussed inACID part 3 in this section.The amount of opening theory is so huge thatwe can only offer a selection of openings. Ifyou want to know more, you can study gamesin Tournament Base or in Turbo Dambase.Turbo Dambase has an online version, youcan check on the Internet.The website of Frits Luteijn can also be usefulto study certain sharp openings.Having knowledge about openings can saveyou a lot of time during games you play.We also hope youll be inspired to play

interesting openings in order to create nicegames.If you want to know more about excitingopenings like the Fox, Korchov or Keller studyof other sources is needed. You can use theLuteyn website, Turbo Dambasehttp://www.turbodambase.nl/tdamhome.phpor the online Tournament Basehttp://toernooibase.kndb.nl/


Choose your strategy!1. The eagle

2. The wild horse

Guessing the opening

The cheetah reviewed

The Springer Contra Attaque

The black pantherRoozenburg attack

A sharp position in the Chizhov-exchangevariation of 1.32-28 19-23

Opening traps

Solutions
http://www.turbodambase.nl/tdamhome.phphttp://www.turbodambase.nl/tdamhome.phphttp://toernooibase.kndb.nl/http://toernooibase.kndb.nl/http://toernooibase.kndb.nl/http://www.turbodambase.nl/tdamhome.php


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Choose your strategy!

1) The eagle

1.32-28 18-22

A) Why would someone choose this openings-move (18-22)?

We follow the Krajenbrink Presman gamefrom 1997.

2.31-27 22x31 3.36x27

White evades theoretical lines, while getting agood position controlling .

3... 12-18

In a ChizhovSijbrands game from the worldtitle match 1990, Chizhov continued 4.27-2218x27 5.28-23 19x28 6.33x31 ...

B) Can you think of a reason why white chosethis quiet continuation, while he was trail ing inthe match and had to win a game in order toequalise?

4.41-36 7-12 5.46-41

Well watch the position after the logicalcontinuation 19-23 6.28x19 14x23.

C) Show a logical line in which white gets anactive position.

5... 17-21 6.37-32 11-17 7.41-37 19-238.28x19 14x23 9.34-29 23x34 10.39x3020-25

D) Comment on this move please! Would youalso choose this continuation?

We will now look at sharp play:

2.37-32 12-18 3.41-37 7-124.46-41 1-7 5.34-29

In part 3 of A course in draughts we showedthe lines after 5... 19-23. We will look atanother possibility for black.

5... 20-25

We will look at two continuations for white.

6.29-24 19x30 7.35x24 leads to the same

position as after 5.34-30 20-25 6.30-24 19x307.35x24.

7... 14-20 is met by 8.39-34 or 8.33-29.

E) How would you continue with white (andwhy)?

White often plays 6.39-34

F) Whats the difference with the central 6.40-34 ?

Some players, like the former Jannes van derWal and (to name a modern player) the Dutchcrack Wouter Sipma, like to play 6... 22-277.31x22 18x27 8.32x21 17x26.

G) What strategy does black want to follow?

We will look at a game in this opening from theworld championship cadets 2012.

M. van Ijzendoorn - D. Rusaev

1.32-28 18-22 2.37-32 12-18 3.41-37 7-124.46-41 1-7 5.34-30 20-25 6.30-24 19x30

7.35x24 14-20 8.33-29 22x33 9.39x28 18-2210.38-33 10-14 11.42-38 4-10 12.47-42

Black is ready to begin a rush on the whiteoutpost. But white can defend against thisrepeated attack with precise play.


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12... 14-19 13.40-35 19x30 14.35x24 10-1415.44-40 14-19 16.40-35 19x30 17.35x24 5-10

18.49-44!

Martijn van IJzendoorn knows how to play thisopening. Base piece should stay on itsspot.

H) Can you give a logical line if white plays18.50-44? 10-14 19.44-40 ?

18... 10-14 19.44-40 14-19 20.40-35 19x3021.35x24 9-14 22.45-40 3-9 23.43-39! 14-19

24.40-35 19x30 25.35x24 9-14 26.48-43!

The punchline of whites play is that 26... 14-19can be met by 27.32-27 due to the base piece

on . 27... 19x30 28.27x9 8-13 29.9x1812x34 30.37-32 with an advantage for white,who has a stronger centre position.Rusaev chooses another move..

26....16-21 27.31-27 22x31 28.36x16 14-1929.32-27 19x30 30.29-23! 20-24?

It was better to play 30-34x34. Now white gesta very strong attack.

31.27-22! 15-20 32.37-32 13-19 33.23x1420x9 34.50-44 8-13 35.33-29 24x33 36.38x29

9-14 37.41-37 2-8 38.42-38 14-20 39.39-3330-35 40.43-39 13-19 41.29-23 8-13 42.23x14

20x9 43.33-29 13-19 44.39-34 9-14

White has a winning position.

I) Try to find the right way to finish off thegame.

2) The wild horse

1.35-30 20-25

Agafonov-variation goes 1.33-29 15-20 2.29-23 19x28 4.32x23 18x29 5.34x23 25x346.40x29

A) Predict what kind of game will probably beplayed from this opening?

R. Vos

M. Podolskiwent:6... 10-15 7.45-40 16-21! 8.37-32

8... 13-19!

White should play 9.32-28 now.

B) How did black gain a piece after 9.31-27?19x37 10.27x16 ?

P. Roozenburg P. Bergsma 19696.... 16-21 7.37-32 21-26 8.41-37 20-25

9.45-40 13-18 10.50-45 17-2211.38-33 11-17 12.46-41 6-11

13.31-27 22x31 14.36x27 25-30!


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Black forces a win. He threatens to play 18-2230-34 14-19 12x25 B+1.

C) How should 15.40-35 be met?

Usually white continues 2.40-35 15-20 3.45-40

20-24 4.33-29 24x33 5.38x29

Black can choose from several plans.

5... 17-22

D) Why should white not play 6.42-38?

Gantwarg Wiersma 1978 went as follows:

6.43-38 11-17 7.38-33 6-11 8.30-24 19x309.35x24 22-27 10.32x21 17x26

E) Try to describe this position. Would yourather play it with white or with black?Black usually performs another plan againstthe wild horse in recent games.

5... 10-15 6.50-45 5-10 7.42-38 16-21

E) Why is 8.31-26 not so attractive for white?

8.47-42 21-26 9.39-33

Black has two major options:9... 17-22 and 9... 15-20.

J. de Vries K. Thijssen2012 was:9... 15-20 10.43-39? 10-15 11.30-24 19x3012.35x24 18-22!

F) How do you judge this position?

White should play (9... 15-20) 10.44-39

G) Why is this a more logical move than 43-39?

Black has still another plan after 10.44-39

H) Which plan do we mean? Do you like thisplan?


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Can you find the opening that leads to the

1 Black

2

3

4 Black

position shown?

5

6

7

8


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1.34-30 20-25 2.30-24 19x30 3.35x24 18-224.33-29 14-20 5.38-33 10-14 6.32-28 16-217.37-32 11-16 8.43-38 6-11 9.31-27 22x3110.36x27 21-26

A sharp and very interesting position.Theory says white has to play 41-36.

A) Which strong move does black play if whitecontinues 11.41-37?

11.41-36 4-10(!)

Theory says that white should play 12.47-41.Also interesting is 12.49-43?! the move of

Erwin Heslinga. Black has an extra option, hecan also play 11... 17-21 with sharp lines.

B) How can black make a forcing after 12.46-41?

12.47-41 26-31!

The theory Sijbrands wrote about this openingdidnt contain this surprising move ... It wasintroduced in a game M. de BlockS. Kramer.

C) Show the king shot black takes after 13.27-22?

The line continues:13.27-21 16x27 14.32x21 17x2615.36x27 14-19 16.40-35 19x3017.35x24 9-14 18.44-40 14-19

19.40-35 19x30 20.35x24 10-14

Since white cant defend the piece playing21.45-40? White must defend horizontally:

21.28-23 13-19 22.24x13 8x2823.33x22 14-19

With a better position for black. He can playaround piece , while controlling the otherwing and whites left wing isnt developed well.

If white doesnt want to play these lines, he canchoose a line in which he goes to

4) How does this line go?


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The Springer Contra Attaque

1.32-28 19-23 2.28x19 14x23 3.37-32 10-144.41-37 5-10 5.46-41 14-19 6.35-30 20-257.33-29 9-14 8.40-35 3-9 9.45-40 23-2810.32x23 19x28

White must choose between 11.39-33 and11.30-24Its no good playing the slow 11.50-45?16-21! 12.31-26 21-27

A) How is 13.38-33 punished now?

B) How is 13.37-31 punished?

13.30-24 is met by a pseudo-sacrifice: 13.. 28-

33! 14.39x28 14-19 15.43-39 19x30 16.35x2427-31 17.36x27 15-20 18.24x15 25-3019.34x25 17-22 20.28x17 12x23.

C) Why is black better after this play?

13.38-32 27x38 14.43x23 13-19 also givesblack an advantage.

Lets have a look at (first diagram) 11.39-3328x39 12.44x33 16-21 13.31-26 21-27 14.43-39

Black has two different strategies. The oldstrategy is to play a right wing attack: 14... 17-22 15.48-43 18-23 16.29x18 12x23.

The modern strategy however is introduced by14... 11-16

D) Which strategy does black want to follow?

A nice strategic game to show the idea of blackis Clerc- Gantwarg 1990.

Clerc Gantwarg 19901.32-28 19-23 2.28x19 14x23 3.37-32 10-144.41-37 14-19 5.46-41 5-10 6.35-30 20-257.40-35 9-14 8.33-29 3-9 9.45-40 23-2810.32x23 19x28 11.39-33 28x39 12.44x33 16-21 13.31-26 21-27 14.43-39 11-16 15.48-43

17-21 16.26x17 12x21 17.37-32 7-12 18.41-376-11 19.33-28 21-26 20.32x21 26x17 21.38-3316-21 22.42-38 21-26 23.38-32 1-6 24.30-2417-21 25.28-23 21-27 26.32x21 26x17 27.50-44 17-22 28.33-28 22x33 29.39x28 11-1730.43-38 6-11 31.44-39 11-16 32.38-33 18-2233.49-43 22-27 34.43-38 17-22 35.28x1712x21 36.24-20 15x24 37.29x20 10-15 38.34-29 15x24 39.29x20 8-12 40.40-34 21-2641.34-29 12-17 42.20-15 17-22 43.29-24 13-1944.24x13 9x29 45.33x24 2-8 46.39-33 8-1347.33-29 13-18 48.38-33 14-20 49.37-3227x38 50.33x42 22-28 51.42-37 16-21 52.36-

31 18-22 53.37-32 28x37 54.31x42 22-2855.24-19 20-24 56.19x30 25x23 57.35-30 28-33 58.30-25 33-39 59.25-20 39-43 60.42-3843x32 61.20-14 21-27 62.47-42 27-31 63.14-94x13 64.15-10 13-19


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The second option in diagram 1 is 11.30-24.

The main line is: (11... 14-20 12.31-27 is alsointeresting)11... 18-22 12.38-33 12-18 13.42-38 7-1214.31-26 1-7 15.48-42

In H. Wiersma K. LeesmannEU-ch 199915... 16-21? was played.

The right move in this position is 15... 14-20.

E) How is 15... 14-20 16.38-32? punished?

The main line continues: 15... 14-20 16.37-3110-14 18.41-37 21-27 19.35-30

Black shouldnt play 19... 27-32? 20.38x27 11-

16 because of 21.42-38

F) How does white meet 21... 17-21 22.26x1712x41?

19... 4-10 is met by 20.24-19 13x35 21.29-2318x29 22.34x21.

The right move is 19... 11-16. Now white canchoose from20.24-19 13x35 21.29-24 20x29 22.34x2116x27 23.33-28 (or 23.37-32) 22x33 24.31x116x17 25.39x28and20.38-32 27x38 21.43x23 7-11 22.33-28 22x3323.39x28 18-22 24.42-38 22x42 25.47x38 (asin T. SijbrandsJ. de Leeuw).

Wiersma Leesmannwas:16... 14-20 17.24-19!! 13x24 18.38-32 10-1419.32x23 22-28 20.33x13 8x28 21.43-38

24x33 22.38x29 20-24 23.29x20 15x24 24.49-43 4-10 25.36-31 2-8 26.42-38 17-22 27.26x1712x21 28.34-30 25x34 29.40x20 14x25 30.38-32 21-27 31.32x21 11-16 32.21-17 22x1133.43-38 8-13 34.31-27 7-12 35.47-42 10-1436.38-33 12-17 37.33x22 17x28 38.42-3811-17 39.27-22 28-33 40.39x28 14-1941.22x11 6x17 42.44-39 13-18 43.45-40 9-1344.40-34 19-24 45.39-33 13-19 46.38-32 18-2347.37-31 17-21 48.31-27 21-26 49.28-22 26-3150.27x36 25-30 51.34x25 23-29 52.22-1829x27 53.18-12 24-29 54.12-729-33 55.7-1 (2-0).


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The Black pantherRoozenburg attack

1.32-28 16-21 2.31-26 18-22 3.37-32 11-164.41-37 7-11 5.34-29 1-7 6.46-41

Georgiev played the interesting 6.39-34against Jan Groenendijk. After 13-18 7.29-2318x29 8.33x13 22x33 9.38x29 9x18 10.37-318-13 11.31-27 followed, with a dangerous rightwing lock for black.

6.40-34 can be met by 13-18 followed by 19-23x23 and 21-27x27 black taking a right wingattack.This is the reason white plays 6.46-41.

A) How would you react on 6... 13-18 now withwhite?

Usually black plays the Andreiko variation with6... 20-25, but even sharper is 20-24x24 with aRoozenburg-attack.

6... 20-24 7.29x20 15x24 8.40-34 13-189.37-31 21-27 10.32x21 16x27 11.42-37

White wants to attack the outpost as quickly aspossible. This usually is the best plan against aRoozenburg-attack.

9-13 12.37-32 11-16 13.32x21 16x27

14.48-42 7-11 15.41-37

Black has to invent a plan to stop the rush oonblacks outpost. If he plays the slow 15... 10-15(like in LacroixKocken) the repeated attackon the outpost is very dangerous:

16.37-32 11-16 17.32x21 16x27 18.47-41 3-9?19.34-30! 6-11 20.41-37 11-16 21.37-32 5-1022.32x21 16x27 is a position black shouldavoid at all costs.23.30-25 15-20 24.45-40White can also win a piece by 24.33-29 24x3325.38x29 22x24 26.31x11 12-17 27.11x2218x27 28.42-37 13-18 29.43-38 etc W+1.18-23 25.50-45 23x32 26.33-29 24x3327.39x37 winning the outpost at .

15... 11-16 16.37-32 6-11 17.32x21 16x2718.47-41 2-7!!

If white would be able to attack oncemore, black is lost, since defending with 11-16will open the 31 x 2 track to king for white:19.41-37 4-9 20.37-32 11-16 21.32x21 16x2722.33-29! W+.But 19.41-37? Is punished by a kingshot now.

B) How is 19.41-37 punished?

C) How should black react on 19.34-29 ?

19.34-30 4-9

The point of blacks play is that white cant play20.41-37 now.

D) How does the forcing for black go after20.41-37 ?

20.30-25 18-23 21.45-40 23x32 22.33-2924x33 23.39x37 19-23

The Roozenburg-attack is broken. A right wingattack for black remains. White has still a base


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piece on . Therefore the attack on isstill of concern.

If white attacks 24.37-32 black can make anexchange.

E) How does this exchange go?

24.43-39

White wants to use the 39/44/50 tail in order toremove a piece on if black uses thehorizontal defence of the outpost. The mainline used to be 24... 23-28 25.39-33 28x3926.44x33 22-28 27.31x22 28x39 28.49-4417x28 29.44x22 12-17 = as mentioned in abook of Sijbrands and De Schaap, Beterdammen.Salom played 24... 13-19 agaisnt Vrijland,who went wrong attacking 25.37-32?

F) Which kingshot did black perform?

24.... 14-19?!

This move was introduced by Ben provostagainst Goedemoed. It turns out to be abrilliant trap.

G) Which great shot introduced by 17-21!follows if white attacks (like in the game)25.37-32? As a matter of fact black could have

performed an anologue shot as after 24.. 13-1925.37-32? but this (double) shot is even better.

25.40-34

An interesting game lies ahead. Black mustchoose from 25... 23-28 26.34-30 19-23 27.30-24! and 25... 10-14 26.37-32 23-28 27.32x23*19x28 28.35-30In both cases white can play against the rightwing attack because he holds the 39/44/50 tailwith the possibility to eliminate an outpost at.

Piet Roozenburg (l) with Raoul Dagenais


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A sharp position in the Chizhov-exchangevariation of 1.32-28 19-23

We use the game R. Clerc E. Watoetin1994.

1.32-28 19-23 2.28x19 14x233.37-32 10-14 4.41-37 14-195.34-29 23x34 6.39x30 5-107.44-39 10-14 8.40-34 16-21

9.31-26 11-16 10.32-28 18-2211.30-25 12-18 12.34-30 8-12

13.45-40 6-11 14.39-34 1-615.46-41 2-8 16.50-45 4-10

This sharp position has emerged in manygames. Black played 16... 4-10 to be able toplay 18-23 at the next move. The immediate16... 18-23 can be met by 17.30-24 etc.

White has several ideas to his proposal in thisposition.The main line used to be 17.37-31 18-2318.34-29 and both captures are possible. Blackwants to break the position and get an attacklater, like in the ClercVatoetin game.

Later other moves were introduced.

A) Nobody ever played 17.37-32? Why not?

White can play 17.36-31?! hoping for hisopponent to play the seemingly attractive 21-27. The right move is 17... 18-23.

B) After 17.36-31?! 21-27 white wins by adouble sacrifice! How does this go?

White can also opt for 17.38-32.

C) How would you continue with black after17.38-32 21-27 18.32x21 16x27 19.43-38 ?

After 17.37-31 black shouldnt play 20-24?

D) How should white continue after 18.41-37!18-23 in order to tactically take advantage ofblacks weak left wing?

In ClercVatoetin black got a strong attackand won the game:

17.37-31 18-23 18.34-29 23x3419.30x39 20-24 20.40-34 12-1821.34-30 8-12 22.41-37 18-23

23.47-41 23x32 24.38x18 12x2325.37-32 3-8 26.43-38 23-28

27.32x23 19x28 28.30x19 14x2329.33x22 17x28 30.26x17 11x22

31.49-43 13-18 32.41-37 7-1233.38-32 9-13 34.43-38 10-14

35.35-30 6-11 36.30-24 11-1737.45-40 17-21 38.40-35 21-2739.32x21 16x27 40.31-26 12-1741.39-34 8-12 42.37-32 28x3743.42x31 23-28 44.48-43 28-3345.38x29 27-32 46.43-39 22-2847.35-30 18-22 48.39-33 28x39

49.34x43 B+We covered this position only superficially.

E) If you want to know all details (or simply:more) about this opening position, how should

you study it?


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Opening traps

Try to follow the game without a board. Whichshot is performed?If it is too difficult to play the game blindly justplay the moves on your board.

1) T. Sijbrands G. Feldl EU-ch 1967

1.31-26 18-23 2.33-29 12-18?

2)H. Jansen H. VerminNLDch19811.32-28 18-23 2.33-29 23x32 3.37x28 20-254.41-37 17-21 5.29-24 19x30 6.35x24 12-187.37-32 7-12 8.39-33 1-7 9.44-39 11-17 10.31-26 14-20?

3)H. Jansen

W. Wesselink1.31-26 19-23 2.34-30 14-19 3.30-25 19-244.25x14 10x19 5.40-34 5-10 6.45-40 10-147.37-31 23-29 8.34x23 19x37 9.41x32 13-1910.47-41 18-23 11.31-27 12-18?

4) B. Raven A. Scholma NLD-ch19961.33-28 20-25 2.39-33 15-20 3.44-39 10-154.31-26 5-10 5.36-31 18-22 6.34-29?

5)V. Wirny A. Chizhov Maars 1991

1.32-28 19-23 2.28x19 14x23 3.37-32 10-144.41-37 17-21 5.34-29 23x34 6.39x30 11-177.44-39 7-11 8.50-44 1-7 9.30-25 13-19 10.35-30?

6) H. Grotenhuis ten Harkel J. KrajenbrinkNijmegen 19901.32-28 18-22 2.37-32 12-18 3.41-37 7-124.46-41 1-7 5.34-30 20-25 6.30-24 19x307.35x24 14-20 8.33-29 22x33 9.39x28 18-2210.38-33 10-14 11.43-39 13-18 12.42-38 9-1313.31-26 14-19 14.40-35? 19x30 15.35x24

7)A. Chizhov I. Dan-Gur 19831.33-29 19-23 2.35-30 20-25 3.40-35 14-204.44-40 10-14 5.38-33 14-19 6.30-24 19x307.35x24 17-22 8.42-38 9-14 9.32-28 23x3210.37x17 11x22 11.41-37 16-21?

8)A. Baljakin G. Schoenmakers 20071.32-28 17-22 2.28x17 11x22 3.37-32 6-114.41-37 12-17 5.46-41 7-12 6.31-26 19-237.34-29 23x34 8.40x29 16-21

9)M. Walraven W. Koppejan 20061.34-30 18-23 2.30-25 12-18 3.40-34 7-124.34-30 17-21 5.31-26 1-7 6.26x17 12x217.37-31 21-26?

10)H. V.d. Zee

U. Ilves Tallinn 19961.34-29 19-23 2.40-34 14-19 3.45-40 10-144.32-28 23x32 5.37x28 5-10 6.42-37 17-227.28x17 11x22 8.37-32 6-11 9.41-37 1-610.31-26 19-23 11.46-41 22-27 12.32x2116x27 13.48-42 14-19?

11)N. Waterink R. Boomstra

MTB Hoogeveen, 16-08-20111.34-30 18-22 2.40-34 12-18 3.30-25 7-124.45-40 19-23 5.34-30 1-7 6.31-27 22x317.36x27 17-21 8.33-28 11-17 9.28x19 14x23

10.25x14 10x19 11.39-33 7-11 12.33-28 21-2613.41-36?

12)E. Bronstring R. Clerc NLD-ch 19761.33-28 18-22 2.38-33 12-18 3.43-38 7-124.49-43 1-7 5.31-26 19-23 6.28x19 14x237.33-28 22x33 8.39x19 13x24 9.37-31 9-1310.41-37 4-9 11.46-41 10-14 12.44-39 5-1013.31-27 20-25 14.37-31?

13)T. Sijbrands B. Habets

Blindfold game 19661.31-27 17-21 2.37-31 21-26 3.41-37 19-234.33-28 14-19 5.39-33 10-14 6.34-30 20-247.44-39 12-17?

14)M. Sjawel I. Koeperman 19551.31-26 19-23 2.37-31 14-19 3.41-37 10-144.46-41 5-10 5.31-27 20-24 6.34-30 24-297.33x24 23-28 8.32x23 18x20 9.30-25 20-24?

15)T. Sijbrands J. Algra 1997

1.33-29 18-22 2.31-26 13-18 3.36-31 19-234.35-30 8-13 5.32-27 20-25 6.40-35 14-207.30-24 9-14 8.44-40 14-19 9.50-44 19x3010.35x24 3-8 11.40-35 4-9 12.41-36 23-28?

16)R. Vipulis A. Kalmakov1.32-28 18-23 2.33-29 23x32 3.37x28 20-244.29x20 15x24 5.39-33 12-18 6.41-37 7-127.44-39 10-15 8.46-41 5-10 9.34-30 15-2010.30-25 10-15 11.37-32 16-21 12.31-26?


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Solutions

Choose your s trategy!

1A) If you play this opening with black youneed to have theoretical knowledge of the

positions that can emerge on the board after2.37-32 12-18 3.41-37 7-12 4.46-41 1-7. Blackshould be prepared for 5.34-30, 5.34-29 and5.31-26. Black hopes his knowledge will givehim the advantage to play these lines.

B) Chizhov didnt feel like playing sharp lines inthe opening, since he feared the huge amountof knowledge Sijbrands has about openingtheory. He wanted to evade Sijbrandsopeningpreparation.In Chizhovs opinion Sijbrands plays verystrong in positions with an advantage, but he

had little experience playing positions withoutan advantage. He hoped Sijbrands wouldmake mistakes in these kinds of positions. Sohe chose simple openings, without giving theopponent any advantage again and again.Eventually Chizhov was successful in hisstrategy. In the 17

thgame of the match

Sijbrands went wrong and lost a game,equalising the score. Chizhov remained worldchampion after a 2020 score.

C) M.Coenegracht S. Buurke went: 7.36-31 1-7 8.41-36 10-14 9.47-41 14-19 10.37-32

5-10 11.41-37 10-14White built a cannon athis left wing. Next exchange is standard incannon play: 12.34-29 23x34 13.39x30whitehaving an active game with a strong centreand controlling .

D) Black offers his opponent 2 temps and a lotof space at the right flank. White uses thisspace to go to and building a pyramid.White gets an active centre position andlaunches a centre attack. The game went:11.44-39 25x34 12.40x29 1-7 13.39-34 10-1414.45-40 14-20 15.43-39 5-10 16.49-43 10-14

17.50-45 21-26 18.35-30 20-25 19.29-2318x29 20.34x23 25x34 21.40x29 13-18 22.39-34 7-11 23.34-30 17-21 24.43-39 14-1925.23x14 9x20 26.48-43 20-25 27.29-2325x34 28.39x30 18x29 29.33x24 8-13 30.38-33 13-18 31.33-28 2-8 32.43-38 12-17 33.38-33 3-9 34.30-25 8-13 35.45-40 9-14 36.40-3517-22 37.28x17 11x31 38.36x27 4-9 39.33-2818-22 40.28x17 21x12 41.42-38 6-11 42.38-3311-17 43.33-28 13-18 44.47-41 9-13 45.41-3617-21 46.35-30 14-19 47.25-20 26-31 48.37x813x2 49.24x22 15x35 50.22-18 35-40 51.18-13 40-44 52.13-9 44-49 53.9-3 49-43 54.28-23

43-48 55.3-26 48-25 56.23-19 25-3 57.19-133-25 58.32-28 W+

E)White can choose from two lines:1) 8.39-34 20x29 9.34x23 18x29 10.33x2422x33 11.38x29 If you want a quiet attack thisis a good continuation for white. There is notmuch theory on this play.

2) 8.33-29 22x33 9.39x28 leads to a sharperposition, but you have to know theoretical lineslike:

A) 9...17-21 10.29-23 20x29 11.23x34 21-26You have to ask yourself if you want to playthis type of game. White has a dangling pieceon compensated by a good centreposition. If black plays 11-17 you have tochoose: allowing a lock with 17-21 or going tothe edge changing 27-21x21.B) 9...18-22 10.38-33 10-14 gives a theoretical

line, but black can also play differently:10...13-18 11.42-38 9-13 12.44-39 22-27

13.31x22 18x27 14.32x21 16x27 (or also17x26) with an interesting modern game. Theadvantage for black is that white cant rely ontheoretical knowledge.

F) 6.40-34 would allow 15-20 and after 7.45-4019-23 8.28x19 14x23 9.32-28 23x32 10.37x28black can centralise his pieces if he wants,changing 20-24x14.6.39-34 eliminates the 15-20 move. 6.39-3414-20 also isnt attractive for black, after 7.29-23 18x29 8.34x14 10x19 9.43-39 piece


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C) 15.40-35 should be met by 10-15 16.35x2418-22 17.27x18 26-31 18.37x26 14-1919.23x14* 12x34 20.39x30 9x27 B+1.In the game black took a wrong temp, openingking-square :15... 1-6? 16.35x24 18-22 17.27x18 26-31

18.37x26 14-19 and white could take19.24x13! 8x46 20.26-21! 12x34 21.21x1 9-1322.1x40 46-14 =.

D) 6.42-38? 19-24! 7.29x20 22-28 8.32x2318x29 9.34x23 25x45 10.20-15 13-18 11.39-3318x29 12.33x24 14-20 13.44-39 20x29 14.39-33 29-34 B+1

E) White has a right wing attack. His centraldefence is a bit weakened, aremissing in the Drenth-zone. Black has edgepieces but no piece on . Black

has the Drenth pyramid to play against theattack. If white plays 31-27 black can chancethe type of game changing 14-20 24x15 25-3034x25 18-22 27x18 12x45 with a veryinteresting game.The GantwargWiersma game went:11.42-38 11-17 12.47-42 17-22 13.31-2722x31 14.36x27 12-17 15.37-31 26x3716.42x31 8-12 17.49-43 17-21 18.48-42 21x3219.38x27 12-17 20.41-37 7-12 21.37-32 17-2122.46-41 21-26 23.42-37 12-17 24.41-36 17-2125.24-20 10-15 26.50-45 15x24 27.29x20 2-828.20-15 5-10 29.40-35 White is arc-locked

and has a lack of space. Black is better.29... 13-19 30.43-38 18-23 31.33-28 8-1332.38-33 1-7 33.35-30 14-20!34.15x24 10-15? [ 34...9-14! 35.45-40 10-15 36.33-29 14-2037.29x9 4x13 38.28-23 20x18 gives black theodds. ] 35.33-29 7-11 36.29x18 13x3337.24x13 9x18 38.39x28 15-20 39.45-40 18-23 40.28x19 20-24 41.19-14 24x35 42.34-2925-30 43.29-23 11-17 44.23-19 4-9 45.14-1030-34 46.40x29 17-22 47.27x18 9-13 48.19x83x34 W+

F) Whites right wing attack is blocked and heis in big trouble. Black has the odds.In the game white played

13.31-27? 22x31 14.36x27 which cost a pieceafter 14-19! 15.40-35 19x30 16.35x24 17-2217.27x18 12x23 18.29x18 20x40 19.45x3413x22 B+1.13.32-28 is met by 17-21! 14.28x17 11x22 andwhites attack is blocked, but he may be able toescape playing 15.49-43 21-27 16.34-3025x23 17.24-19 13x24 18.33-29 23x3419.39x10 9-14 20.10x19 4-10 21.43-39 3-922.40-34 and piece ,19> is defended (9-14 ismet by 38-33-28 =).13.49-43 14-19 14.40-35 19x30 15.35x24 12-18 doesnt look attractive either for white.

G) 10.44-39 10-15 can be met 11.29-23 18x2912.33x24 20x29 13.34x23 25x34 14.40x2919x28 15.32x23 with a centre attack for white,although black can play against this attack,having many formations (all pieces in the

Drenth-zone are still there!).

H) 10.44-39 19-24 11.30x19 13x24 12.49-44 9-13 13.35-30 24x35 14.29-23 18x29 15.33x15leads to a fascinating game, especially forblack players who like to play against the edgepiece on .


1) Keller-opening:1.33-29 17-22 2.39-33 11-17 3.44-39 6-11

4.50-44 1-6 5.31-26 16-21 6.32-28 19-237.28x19 14x23 8.35-30 10-14 9.30-24.

2) Korchov-opening:1.32-28 17-22 2.28x17 11x22 3.37-32 12-174.31-26 6-11 5.36-31 8-12 6.32-27 16-217.27x16 22-28 8.33x22 18x36

3) Chizhov-attack1.32-28 17-22 2.28x17 11x22 3.37-32 6-114.41-37 12-17 5.46-41 8-12 6.32-28 16-217.31-26 21-27 8.35-30 2-8 9.30-25 19-2310.28x19 14x23 11.25x14 10x19

4)The Russian bear1.32-28 20-25 2.37-32 15-20 3.41-37 10-154.46-41 5-10 5.31-27 19-23 6.28x19 14x237.33-28 9-14 8.28x19 14x23 9.39-33 10-1410.36-31

5) Fork-lock opening1.34-29 20-25 2.40-34 14-20 3.45-40 10-144.32-28 17-21 5.31-26 19-24 6.26x17 11x227.28x17 12x21

6) The big leap

1.31-27 17-22 2.36-31 22-28 3.32x23 19x284.33x22 16-21 5.27x16 18x36 6.37-32 14-197.41-37 10-14

7) The Fox1.32-28 18-23 2.33-29 23x32 3.37x28 20-254.41-37 12-18 5.29-24 19x30 6.35x24 7-127.39-33 1-7 8.44-39 14-20 9.37-32 20x2910.33x24 10-14 11.50-44

8) The Cheetah1.34-30 20-25 2.30-24 19x30 3.35x24 18-224.33-29 14-20 5.38-33 10-14 6.32-28 16-21

7.37-32 11-16 8.43-38


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A) Black plays 11...1-6! Threatening to play 17-22. For example: 12.49-43 17-22 13.27x1812x34 14.40x29 14-19 winning the outpost.

Therefore white has to fly to the edge playing12.27-21 16x27 13.32x21 with an advantagefor black. J. TerpstraP. Schellekens went:13... 5-10 14.46-41 17-22 15.28x17 11x2216.21-16 14-19 17.40-35 19x30 18.35x24 10-14 19.45-40 14-19 20.40-35 19x30 21.35x249-14 22.44-40 3-9 23.49-44 14-19 24.40-3519x30 25.35x24 9-14 26.37-32 22-2727.32x21 26x17 28.44-40 14-19 29.40-3519x30 30.35x24 4-9 31.50-45 9-14 32.45-4014-19 33.40-35 19x30 34.35x24 13-18! 35.16-11 7x16and with a piece more black won.

B) A (rapid) game R. Heusdens

H. Wiersmawent: 12.46-41? 14-19! 13.40-35 19x3014.35x24 9-14 15.44-40 14-19 16.40-35 19x3017.35x24 10-14 18.45-40 26-31!The point is that 19.27-21 fails due to 16x2720.32x21 17x26 21.36x27 25-30! 22.24x35 20-24 23.29x18 12x45 B+1.19.27-22 13-18 Even better than 31-37 25-3020-24 etc.20.36x27 18-23 21.28x10 17x46 22.10-4 46-28 23.33x22 8-13 24.4x18 12x21 B+

C) 13... 13-19!! 14.24x4 14-19 15.36x27 8-13

16.4x18 12x43 17.48x39 14-19 18.28x1917x48

The Spr inger Contra At taque

A) 13.38-33 27-32 14.33x22 18x27 15.37x2817-21 16.26x17 11x24 17.30x19 14x23

B) 13.37-31 28-33! 14.39x28 17-21 etc. B+1.

C) Black holds the centre, while white hasinactive edge pieces at .

D) Black wants to play against the pieces atwhites right wing. He wants to play 17-21x21and if white is ready to launch an attack with29-23 after having played 48-43 & 50-45 blackplays 18-22, so whites right wing cant bedeveloped.

E) 17... 10-14 18.32x23 22-28! 19.23x32 18-2320.29x18 20x27 B+1.

F) 23.38-32 28x26 24.33-28 22x33 25.29x3820x29 26.34x1 25x34 27.40x29 and black cant

go to king (it is caught with 38-32).

4) 4.31-26 14-19 5.40-35 19x30 6.35x24 10-147.24-20 15x24 8.33-28 22x33 9.38x20 12-1810.20-15

The black panther Roozenburg at tack

A) 6.46-41 13-18 can be met by 7.29-23 18x298.33x13 9x18 9.37-31 22x33 10.39x28 andblack has to take care for a right wing lock.We show a funny game in which black crashedquickly.

R. Boomstra E. Vjasnikov1.32-28 17-21 2.37-32 11-17 3.31-26 18-224.41-37 7-11 5.34-29 1-7 6.46-41 13-18 7.29-23 18x29 8.33x13 22x33 9.39x28 9x18 10.37-31 14-19 11.41-37 10-14 12.44-39 20-2413.40-34 18-23 14.31-27 15-20 15.39-33 8-13

16.34-29! 23x34 17.28-23 19x39 18.50-4439x5019.27-22 17x28 20.26x39 50x3321.38x29 28-33 22.29x38 W+1

B) 19... 27-32! 20.38x27 24-29 with a king at or .

C) 19.34-29 4-9? 20.29x20 14x25 21.41-37isnt good for black. He should play 19... 27-32!20.29x9 32x23 =.

D) 20.41-37 18-23! 21.37-32 24-29! 22.33x2422x33 23.38x18 27x47 24.31-27 13x31

25.24x15 11-16 26.26x37 14-20 27.15x2447x15 B+

E) 24.37-32 22-28 25.31x33 23-28 26.32x2314-20 27.25x14 1039 28.44x33 =

F) 25.37-32 9-13! 26.32x21 14-20 27.25x1423-28 28.14x32 22-27 29.31x22 17x46

G) 24...14-19 25.37-32 17-21!! 26.26x6(26.26x28 12-18 etc. B+) 9-14 27.32x21 14-2028.25x14 7-11 29.6x28 23x45 30.14x23 12-1831.23x12 8x46 B+

A sh arp posi t ion in the Chizhov-exchange

variatio n o f 1.32-28 19-23

A) 17.37-32 fails due to a Mountain shot: 19-23! 18.28x19 14x23 19.25x5 22-28 20.33x2217x46 21.26x17 12x21 and whites king getslost.

B) 17.36-31 21-27 18.34-29! 27x36 19.37-31!36x27 20.30-24 19x30 21.35x24 and black hasno good reply against the 24-19 threat.


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C) Black must either dare to play 19... 18-2320.49-43 23x32 21.37x28 13-18 or go to playing 19... 27-31 20.36x27 22x31.Both 19... 11-16? And 19... 20-24 are punishedby a kingshot for white!

D) KirznerVatoetin was:18.41-37 18-23 19.38-32! Black cant play 21-27! because of 20.32x21 23x41 21.42-3816x27 22.25-20 14x25 23.38-32 27x2924.34x5 25x34 25.40x20 15x24 26.5x46 W+19... 12-18 20.43-38 8-12 21.31-27 22x3122.36x27 3-8 23.37-31 Blacks right wing islocked and his position is lost., because of alack of space. 23-29 24.34x23 18x29 25.49-4313-18 26.43-39 18-22 27.27x18 12x23 28.28-22 17x37 29.26x17 11x22 30.39-34 37x2631.25-20 14x25 32.33-28 23x43 33.34x125x34 34.48x19 W+

E) You can look for games in a database likeTurbo Dambase or if you cant afford to buythis program, you can look for games in theonline Toernament Base (look atwww.kndb.nl)and analyse the crucial games in whichinteresting ideas are shown. You can use acomputer program to help analysing games,like Truus or Kingsrow.

Opening traps

1) 3.29-24! 20x29 4.32-28 23x32 5.34x21

16x27 6.37x28 W+

2) 11.28-22! 17x37 12.42x31 20x29 13.26x1712x21 14.34x1

3) 12.33-29! 23x45 13.27-21 16x27 14.32x2319x28

4) 6...19-23! 7.29x27 25-30 8.35x24 20x299.33x24 17-21 10.26x17 11x35 B+

5) (missed!) 10... 20-24! 11.40-35 14-2012.25x23 18x29 13.30x19 29-34 14.39x30 21-

27 15.32x21 16x27 16.31x22 17x50

6) 15... 18-23! 16.29x27 20x29 17.33x24 17-2118.26x17 11x22 B+7) 12.34-30 25x23 13.31-26 20x29 14.26x105x14 15.33x24 W+

8) 9.29-23! 18x29 10.33x24 20x29 11.32-2722x31 12.36x18 13x22 13.45-40 W+9) 8.33-29! 26x28 9.30-24 19x30 10.35x2423x34 11.39x30 20x29 12.38-33 29x3813.43x1

10) 14.36-31 27x36 15.37-31 36x27 16.33-2823x32 17.29-24 20x29 18.34x5 W+

11) 13... 26-31 14.37x26 17-21 15.26x1711x33 16.38x29 23x25 (or 23x45) B+

12) 14... 24-30! 15.35x24 13-19 16.24x4 14-2017.4x22 17x46 B+

13) 8.27-21! (The bomb shot) 16x27 9.32x1223x41 10.12x23 19x28 11.30x10 5x1412.33x22 26x37 13.42x31 W+14) 10.25-20 14x25 11.27-22 17x28 12.26-2116x27 13.38-32 27x38 14.43x5 W+

15) 13.37-32 28x37 14.27-21 16x27 15.24-1913x33 16.39x28 22x33 17.31x4 W+

16) 12... 18-22! Threatening 24-29 B+1.13.50-44 is punished by 19-23!! 28x10 (28x3014-19 22-28 Z+) 13-19 30x28 22-28 33x2217x46 26x17 46x5 B+.13.39-34 allows the same shot.13.40-34 is met by 24-29! 34x23 21-27 32x2122-27 21x32 17-22 28x17 19x46 B+.
http://www.kndb.nl/http://www.kndb.nl/http://www.kndb.nl/http://www.kndb.nl/


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In part 2 of ACID we offered a lot of theoryabout strategic play. We introduced differenttype of games.In part 3 strategic games were shown.We elaborate on strategy in these differentkinds of game types in this big section.Studying the solutions is very important in thissection. Making the exercises and studying thesolutions will increase your insight in the gamea lot, we hope!We used many examples of grandmastergames to show you high quality strategies!

S3. Strategy

Basic rules

Choose your plan!

Classics

Wing-control

Playing against a weak left wing

Semi-fork

Fork-lock

ATTACKING SYSTEMS:

Right wing attack

Roozenburg attack

Centre attack

Playing against an attack

Solutions

Guessing the moves

Solutions guessing the moves


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Basic rules

1) 1.35-30is a good move

True / false

2) 1... 20-24is a good move

True / false

Position after 1.32-28 19-23 2.28x19 14x233.33-28 23x32 4.37x28 10-14 5.39-33 5-106.44-39

3)6... 17-22 7.28x17 11x22is not a good

move because white can take a semi-fork now.

True / false

4) White doesn't have to fear a semi-fork after1.34-29 23x34 2.40x29since there is no pieceon .

True / false

5)1.40-34isn't a good move, since it allowsblack to take a strong fork-lock.

True or false?

6)1.34-30is a strong move, it gives wing

control in a classical position.

True / false


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7)7.31-26is a good move, since it isdeveloping white's left wing.

T / F

8) The advantage of NOT having a piece oncentre square is that white can use his33/38/42 tail to go to , by playing1.33-2924x33 2.38x29

T / F

9) An advantage of not having played 31-27yet, is that white can launch a Hoogland attacknow.

T / F

10) It is better to launch a right wing attackwithout playing 50-45 first.

T / F

11) Changing 27-22 would not yield anypositive result for white.

T / F

12) It is too dangerous for white to launch acentre attack.

T / F


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13

White should develop his left wing by playing32-28!

T / F

14

Judge this position (white to move)!

15

Explain why whites position is superior.

16

How do you judge this position (white tomove)?

17


18

Judge this position (black to move)!


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Building up

1

Which way to build up would you choose?

A) 38-32 43-38 49-43

B) 31-26 37-31 42-37

2

Which way to build up would you choose?

A) 42-38 43-39 48-43 44-40B) 42-38 44-39 39-33 47-42

3

Which two moves are most logical to build upthe position?

1.32-28 17-22 2.28x17 12x21 3.31-26 7-124.26x17 12x21 5.36-31 1-7 6.31-27 21x327.38x27

4

In the game A. BaliakinTereshko7... 18-23

was played.

A) Explain why this is not the right move.

B) Which move do you think white played inresponse of 7... 18-23?

5

Later in the same game this position emerged.White built up for seven moves. Guess thewhite position after these 7 moves. Draw theposition in the empty diagram!


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Choose your plan!

We show positions from the strategic game A.AndreikoG. Zorn. Try to guess which move

Andreiko played.

1

2

3

Which move would you choose?

4

5

6


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7

A. AndreikoR. Delhom

We see the same construction for white asBaliakin against Tereshko had. White played31-27. Can you explain why he didnt play 34-

29x30?

8

White played 30-24x25.Why didnt he play 33-29?

9

Now white does play 34-29x30. Explain why.

10

White played 30-24x34. Why is he making thisexchange, losing 4 temps?

11

White played 33-29!Why is this a very strong move?

12

Blacks position is very poor because of thenon-active piece on . What is the right

move to convert the advantage into a win?


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Centre play

1

M. DeslauriersI. Kuperman

How would you continue with black? Which

plan do you follow?

2

H. WiersmaP. Bergsma

Which move do you prefer: 45-40 or 44-40?

3

Y. AnikeevT. Burgerhout

White played the remarkable 48-43?!

A) What is the intention of this move?

B) You should be aware of the risks of thismove, if you play it. What risk do we mean?

4

Cai Zhong - Qiu Hao Chun

Black achieved a strong centre position. Howdid he continue at this moment?

5

W. van der KooijG. Jansen

A) Explain why the position (with white tomove) is better for black.

B) Can you show one or more lines that showwhitesproblems?


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6

Try to find the best plan for white!Can you show a logical line in which whitesstrategy succeeds?

Use 15 minutes for analysing the position!

Comment on the moves!

D. van Schaik - K. ThijssenPrague 2012

1.32-28 20-25 2.31-27 19-23 3.28x19 14x23

4.38-32 10-14 5.33-28 5-10 6.28x19 14x237.39-33 10-14 8.44-39 13-19 9.43-38 8-1310.49-43 2-8 11.37-31 14-20 12.41-37 9-14

13.46-41

13... 17-22 14.31-26 22x31 15.36x27 4-916.41-36 11-17 17.47-41 6-11 18.50-44 1-6

19.33-28

19... 20-24 20.34-3025x3421.40x20 14x25 22.38-33 9-14

23.36-31 3-9 24.41-36


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24...17-22 25.28x17 11x22 26.33-28 22x3327.39x28 14-20 28.43-38

28... 25-30! 29.35x24 20x29!30.27-22 18x27 31.31x22 9-14 32.48-43 14-20

33.44-40 20-24 34.43-39

34... 16-21 35.26x17 12x21

36.40-35 15-20 37.39-34 29x40 38.35x44

38... 8-12!39.45-40 23-29!

40.40-35

The rest of the game was:

40... 7-11 41.36-31 21-26 42.32-2729-34 43.38-32 12-18 44.42-38 34-40

45.44-39 40-45 46.38-33 45-50 47.22-1711x22 48.28x17 20-2549.17-116x17

50.39-34 50x22 51.27-21 22x36 52.21x1413-19 53.14x23 36-9 54.32-28 9-4

55.35-30 24x35 56.23-19 4-31 57.37-3231-9 58.28-23 26-31 59.34-29 31-36

60.29-24 25-30 61.32-27 9x31 62.24-2036-41 63.20-15 31-4 64.23-18 4x22

65.15-10 22-4 66.10-5 41-47(0-2)


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T. SijbrandsH. van KlaverenSimultaneous game 1980

1.32-28 18-23 2.33-29 23x32 3.37x28 20-244.29x20 15x24 5.41-37 12-18 6.39-33 7-127.37-32 1-7 8.46-41 10-15 9.41-37 17-21

10.44-39 21-26 11.31-27 18-23

12.36-31

A) Whats the intention of this continuation?

12... 11-17 13.47-41 17-21 14.41-36 12-1815.34-29 23x34 16.40x20 15x24

17.45-40 18-23 18.40-34 7-12 19.49-44

B) How does white continue after 19... 12-18 ?

19... 5-10 20.33-29 24x22 21.27x29

White breaks the classical structure.

21... 12-18 22.39-33 10-15

After 22...19-23 white can remove the piece on by 23.43-39 (or 44-39 & 50-44) 6-1124.33-28 11-17 25.28x19 13x33 26.39x28 17-22 27.28x17 21x12

23.35-30 14-20 24.30-25 19-24

The exchange 24...18-22 25.25x23 22-2726.31x22 13-18 27.22x13 8x30 28.36-31 isntattractive, since black loses control over thecentre.

25.25x14 9x20

C) Why doesnt white fear the semi-fork, blacktook?

26.31-27 6-11 27.43-39 11-17 28.44-40

White built a strong pyramid. He is ready tolaunch a centre attack with 29-23x23.

28... 20-25 29.29x20 25x14 30.50-44 17-2231.48-43 22x31 32.36x27 4-9 33.33-28


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White controls the centre, but to win the gameis a hard struggle, especially if black plays33...18-22 34.28x17 21x12 35.38-33 etc.

33... 14-1934.38-33 18-23

Black tries to make the position classical again,but this actually only helps whites strategy.

35.40-35 2-7 36.42-38 15-20

White removes blacks centre piece.

37.34-29! 23x34 38.39x30 20-2439.27-22!

White launches a Highland attack.

39... 7-12 40.44-39

D) How is 40... 12-18 punished?

White could also have played 40.43-39, forexample: 12-17 41.22x11 16x7 42.28-22 9-1443.32-28 14-20 44.22-18 13x22 45.28x1721x12 46.30-25 8-13 47.25x23 13-18 48.44-4018x29 49.39-34 W+

40...12-1741.22x11 16x7 42.28-22!

E) How is 42... 9-14 met?

42... 7-12

42...7-11 is met by 43.32-28 11-16 44.38-32 8-12 45.28-23 19x17 46.30x8

43.32-28 12-18 44.28-23 19x17 45.30x1913x24 46.37-31 26x37 47.38-32 37x28

48.33x4 (2-0)

P. RoozenburgB. Wiggers

1967

1.31-27 18-23 2.33-28 17-21 3.37-31 12-184.39-33 7-12 5.44-39 21-26

6.49-44 26x37 7.42x31

A) Why does white take 4 temps in a classical

position?


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6.49-44 26x37 7.42x31 12-17 8.47-42 2-79.41-37 7-12 10.46-41 20-24

Occupying edge square is part of whitesstrategy. His centre is strong enough to affordan edge piece. This continuation is the

beginning of a left-wing-attack.

11.31-26

B) How can white continue his strategy bestafter 11...14-20 12.37-31 10-14 13.41-37 5-10?

11... 17-21 12.26x17 11x31 13.36x27 14-2014.37-31 10-14 15.42-37 5-10 16.41-36 20-25

White removes centrepiece and startsthe left-wing-attack.

17.34-29 23x34 18.40x20 15x2419.27-21 16x27 20.31x22 18x27 21.32x21

Black cant reinforce his beleaguered wing with13-18?

21... 10-15 22.36-31 14-2023.31-26 12-18 24.37-32

Black has no purpose for his pieces. He goesto the edge of the board. White centre positiongets even stronger.

24... 24-30 25.35x24 20x2926.33x24 19x30 27.39-33 30-35

28.45-40

Before continuing to play at the left wing, whitecentralizes piece . The white centreposition looks nice.

28... 9-14 29.21-16 14-19 30.32-27 4-9

31.27-21

White builds an active arrow on the left wing.

31... 1-7 32.38-32 15-20 33.40-34 20-2434.43-39 8-12


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White uses the arrow to change back, afterwhich the left-wing attack keeps going.

35.21-17 12x21 36.16x27 18-2337.26-21 13-18

38.28-22

C) Comment on this move!

38... 9-13 39.33-29! 24x33 40.39x28

D) Whats the goal of this exchange?

40... 3-9 41.44-39 9-14

42.21-17

Even stronger was 42.22-17!

E) Show a line, beginning with 42.22-17, inwhich black is frozen out.

42...7-11 43.39-33

43... 14-20

43...11-16 44.17-12 18x7 45.33-29 25-3046.29x20 30x39 is a much better defence.

44.17-12 18x7 45.33-29 25-30 46.29x930x39 47.9-3 20-25 48.22-18 19-24

49.18-13 24-29 50.13-9 39-44 51.50x3929-34 52.39x30 25x34 53.9-4 34-39

54.3-25 39-44 55.25-34 (2-0)

Piet Roozenburg


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P. HoogteijlingM. Dolfing2000

1.33-29 20-24 2.29x20 15x24 3.32-28 17-214.37-32 18-23 5.41-37 12-18 6.31-27 7-127.34-30 11-17 8.39-33 21-26 9.44-39 1-7

10.30-25 7-11 11.40-34

Black breaks open the classical position.

11... 24-30 12.35x24 19x3013.28x19 14x23 14.45-40

14... 30-35

White has to decide what to do with piece. The exchange he makes, brings aboutthat he loses control over , as white is notable to use the 33/39/44 tail anymore. This tail

is useful for the defence of .

15.50-45 35x44 16.49x40 17-21 17.34-2923x34 18.39x30 12-17 19.40-35 10-14

20.45-40 5-10 21.40-34

A) Black has no piece on . Why is thisimportant for his strategy to succeed?

Black puts pressure on now.

21... 17-22 22.46-41 22x31 23.36x27 8-1224.33-28 2-8 25.38-33 12-17 26.41-36

Black built the power-block for the secondtime, again putting pressure on .

26... 17-22 27.28x17 11x31 28.36x27 6-1129.43-38 11-17 30.33-28

Black breaks the position, getting rid of whitespieces on . After this, an attack onwhites left wing starts.

30...18-22 31.27x18 13x33 32.38x29 17-2233.29-24 8-13 34.42-38


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Black centralises pieces on his left wing.All his pieces become active.

34...14-19 35.34-29 10-14 36.38-33 22-2737.24-20 27x38 38.33x42

The attack on whites left wing continues.

38... 19-23 39.29x18 13x22 40.42-38 21-2741.38-33

The attack goes on and on.

41... 27-31 42.30-24 31x42 43.48x37 16-2144.35-30 21-27

45.24-19

Can you show a line after 45.33-29 in whichwhite is frozen out completely?

45...14x23 46.20-14 9x20 47.25x14 23-2848.33-29 27-31 49.29-24 31x42 50.47x3826-31 51.24-19 31-36 52.19-13 36-41 (0-2)


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Classics

1

Playing 48-43 is not good, because whiteshouldnt play the golden piece.

True or false?

2

Blacks position is better, because he controlsboth wings!

True or false?

3

True or false: Blacks position is bad, becausehe has inactive pieces at .

True or false?

4

Whites position is bad because of the danglingpiece on .

True or false?

5

5) White can take advantage of blacksweakened right wing.

True or false?

6

6) White can take advantage of the danglingpiece on .

True or false?


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7

Try to judge this position (white to move)!

8

Black is better, since he controls both wings.

T / F

9

1.36-31

Which move is better now, 4-9 or 4-10 ?

10


11

Which move is better:

11-17 or 1-6?

12

White is losing, for he is frozen out.

T / F


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13


14

Black to move can play a strong Ghestem-lock.

T / F

15

It is a good idea for black (to move) to go to thegraveyard ().

T / F

16

Guess how the game continued. White tomove forced a win.

17


18

Judge this position (white to move)


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19

J

course in draughts exercises 3.8

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