Kauliņu c5 un h4 esamība. 3.daļa

10.09.2021

Autors: Genādijs Šapiro

Info: http://64-100.com/

No. 22.  I. Kuperman – E. Rothenband, 1940 

The future world champion in international drafts gracefully finished the fight.
1.ef2 ef6. White wins beautifully after 1 … cd6 2.fg3 bc7 3.cb2 fe3 4.d: f4 cb6 5.hg5! b: d4 6.bc3 d: b2 7.bc5 d: b4 8.f: f8 h: f4 9.f: h6x.
2.ba5! Preventing 2 … cb6 3.a: c7 b: b4 because of 4.dc3x.
2 … hg5 3.ab6! ca5 4.cd6. As Z. Tsirik pointed out, 4.fg3 also won.
4 … e: c7 5.fg3 with a win.

No. 23.

1 … de5? Responsible decisions require accurate calculation, because there may not be a way back.
2.dc5 ef4 3.bc3 fe5. Black’s plan to capture the center looks convincing, but after  4.cb4 it turns out that 4 … ed6 5.c: e7 f: d6 does not work because of 6.ef2 a: c5 7.fe3 with a breakthrough. I have to change my plan on the fly, but it didn’t make it any easier.
4 … ba7 5.hg5!  White is rebuilding favorably, seizing the important f4 square.
5 … f: h6 6.cb6 a7: c5 7.b: f4.   In a position of five checkers, the rescue for black is no longer visible.
7 … ed6 8.dc3 fe7 9.cd4 ef6 10.ef2 fg5 11.fe3 gh4 12.de5 dc5 13.ef6 cb4. 13 … hg3 14.fe7 g: e5 15.ed8 ed4 (15 … ef4 16.e: g5 h: f4 17.df6x) 16.dh4 d: f2 17.h: e1 cd4 18.ed2x.
14.fe7 bc3 15.fe5 cd2 16.ef8 d: d6 17.f: c5, getting the ending with the posting c1.
GMI Jurija Koroļova analīze:
R. Tomass-G. Shapiro.
G. Šapiro raksta, ka zaudē 1. a1-b2 d6-e6 un pēc 2. b2-c3 b6-a6 3. g1-h2 f4-e3 4. c5-d6 e6: c5 5. d4: b6 e3 : g1 6. b6-c6 h6-g5 un G. Šapiro uzvarēja.
Nevis 1. a1-b2 zaudē, bet 2. bc3, bet baltie var spēlēt 2. gh2 un melnie neuzvarēs. Pēc 2… f4-e3 3. f2-g3 e3-f2 4. g3-h4 f2-g1 5. e1-f2 g1: e3 6. d4: f2 vienkāršs neizšķirts.
Ja viņi spēlē 2…. b6-a6, tad pēc 3. f2-e3 f4: d2 4. e1: c3 h6-g5 5. h2-g3 g5-h4 6. g3-f4 g6-h6 7. a3-b4 neizšķirts.
Bet melnajiem ir ļoti spēcīgs gājiens pēc 1. a1-b2  h6-g5! 2. g1-h2 f4-e3 3. f2-g3 e3-d2 4. e1: c3 g5-h4 5. g3 – f4 g6-h6 6. f4-e5 f6-g5 7. e5-d6 b6-a6 8. a3-b4 a6-b6 9. c5: a6 h4-g3 10. h2: f4 g5: c1 11. a7 – b7 c1-a3 12. c3-d4 a3: f7 13. b7-h2 diagramma
GMI Aleksandra Savina analīze:
Gennady, a very interesting selection. You are well done!
I want to make a small addition.
No. 23
1 … bc7 2.ef2 fg7 3.bc3 gh6 4.fe3 {4.dc5 db4 5.ca5 ed6 6.dc3 de5 7.cd2 hg5 8.de3 cd6 (8 … ef4 9.ed4 cd6 10 .fg3 fe3 11.df2 hf4 12.ab6 fg3 13.fe3 gf2 14.cd4 fe5 =) 9.ab6 dc5 11.bd4 ef4 12.cb4 fd2 13.de5 =} 4 …. cb6 5.ef4 dc5 (5 … ba5 6.de3 dc5 7.db6 ac7 8.cb2 ac1 9.ed4 cg5 10.de5 fb2 11.ha5 =) 6.fe5 {6.de3 ed6 7.cd2 (7.cb4? ba5 8.db6 ac7 9.bc5 db4 10.ed4 bc3 11.db2 cd6 12.bc3 fe5 13.cd2 eg3 14.hf2 de5X) 7 … de5 8.fb4 ac5 9.gf2 hg1 10.cb4 ca3 11.de5 fd4 12.ea7 gc1 13.ab8 =} 6 … ce3 7.eg7 hf8 8.df4 ef6 9.cd4 ba5 10.fg5 fe7 11.dc5 fe5 12.gh6 ef6 13.hg5 fh6 14.hg7 hg3 c =

No. 24.

White needs to take care of protection. After 1.ba5 ed6 2.c: e7 f: d6 they cannot resist the onslaught of black:   3.ba3 (3.bc3 dc5 4.de3 cb4 5.cd4 e: c3 6.ef4 g: e3 7. f: b2 ba3 8.bc3 ab6 9.gf2 bc5 10.fe3 cb4x, as it was in one of N. Kononov’s games) 3 … dc5! (You need to act decisively, not allowing White to play 4.fe3, then 4 … ef4 5.gh2 cd6x decides quickly) 4.de3 ab6 5.fg3 cd6 6.a: c7 d: b8 7.gf4 e: g3 8. h: f2 fe5 9.fg3 gh4 10.gf4 e: g3 11.gh2 bc7 12.h: f4 cd6x.
A draw is achieved in two ways.
 1.ba3 cb6 2.de3 b: d4 3.e: c5 gf4 4.ba5. 4.fg3? f: h2 5.cb6 a: c5 6.b: f4 fe5 7.f: d6 e: c5 with opposition in favor of black.
4 … fe3 5.f: d4 e: c3 6.ab6 fe5 7.gf2 cd2 8.hg5 de1, and White manages to break through to the ladies squares: 9.bc7 e: f6 10.cb8 =.
As you can see, this protection is very difficult; another way of achieving equality is much more effective.
 1.fe3! ed4 2.dc3! d: b6. Nothing gives 2 … d: f2 3.g: e3, and it remains to play 3 … ed6 4.c: e7 f: d6 =, but 3 … cd6?  unexpectedly loses: 4.ba3 fg7 5.cd4 gf4 (5 … de5 is followed by the injection 6.cd6! x) 6.e: g5 gh6 7.ba5 d: b4 (7 … h: f4 8.de5x) 8.a: c3 h: f4 9.cb4 ed6 10.bc5 d: b4 11.a: c5x. Can’t even 3 … cb6? 4.ed4x.
3.ed4 fe5. Or 3 … gf4 4.dc5 =.
4.h: d8 ba5 5.d: f6 fe7 6.d: b6 a: c1 7.f: d8 =.
GMI Aleksandra Savina analīze:
No. 24
1.fe3 cb6 (instead of 1 … ed4) 2.gf2 bd4 3.ec5 ef4 4.fe3 ed6 5.ce7 fd8 6.hf6 fg3 7.dc3 gh2 8.ef4 etc.

No. 25. R. Tomass – G. Shapiro, 1986

1.ab2? It was worth deciding on 1.cd6 fe3 2.dc5 dc7 3.f: d4 c: c3 4.ab4 cd2 5.e: c3 hg5 6.cd6 gf4 7.bc5, etc.
1 … de7 2.bc3 ba7! After 2 … hg5 White will reanimate his position 3.gh2 fe3 4.fg3 ed2   5.cd6! e: e3 6.gf4 d: b4 7.f: f8 bc3 8.ab4 =.
3.gh2 fe3 4.cd6 e7: c5 5.d: b6 e: g1 6.bc7 hg5  In the ending, black leaves no chance of salvation.
7.cb8 gh6 8.bd6 gh4 9.df8 fg5 10.fe7 hg3 11.h: f4 g: e3 12.ef6 gh2 13.cb4 a: c3 14.f: a1 hg3, and White stopped the resistance.

No. 26.

1.bc3 fg5. 1 … hg5 2.gf2 fe3 3.fg3 ef2 (3 … ed2?   4.cb6! A: c7 5.gh4 d: b4 6.de5 f: d4 7.h: e5x) 4.gf4 g: e3 5.e: g3 ab4 =.
2.gf2 fe3 3.fg3 ef2. 3 … ed2?  4.cb6! X, G. Dorfman – L. Sayadyan (1978).
4.gh4 ed6! A subtle saving blow.
5.c: e7 fg1 6.h: f6 g: f8 7.fg7  with a draw.

No. 27.

Position from the game S. Bonadykov – M. Norel (1998).
1 … ab6! An accurate move, fending off the threat of attack 2.fg3 because of 2 … hg7 3.g: e5 bc5x. White’s range of actions has narrowed, and he has to play with only one moves.
2.fe3.  2.bc5.ba7 3.cb2 fg7 4.fe3 fe5 5.e: g5 h: f4 6.d: f6 g: e5 7.ef2 b: d4 8.fe3 d: f2 9.g: g5   9 .. .dc7! 10.gh6 ab6 11.de3 bc5x.
2 … ba7 3.e: g5 h: f4 4.ef2 hg7. Doesn’t give the advantage of 4 … fg7 because of 5.fe3, and 5 … fg5? 6.hg3 f: h2 7.ef4x.
5.cb2.  Forced move, you still can’t 5.fg3? bc5x, and after 5.bc5? wins 5 … gh6 6.cb2 fe5 7.d: f6 e: g5 – zugzwang.
 5 … fg5. In the aforementioned game M. Norel chose another plan, which also deserves attention:  5 … gh6 6.fg3 fe3 7 d: f2 fe5 8.bc5 b.d4   9.gh4 (the rest loses: 9.de3? Hg5 10.e: c5 gh4 11.ab4 ef4 12.g: e5 ed6x; 9.ab4? ed6 10.de3 fe7 11.e: c5 ef4x) with equal play. Then 9 … hg5 10.h: f6 e: g5 11.de3 dc7 12.e: c5 cb6 13.cd6 e: c7 14.hg3 cd6 15.fe3   15 … de5 16.ed4 ab4! 17.c: c7 (17.a: c5? Gh4 18.d: f6 h: f2 19.g: e3 b: f2x) 17 … e: a1 =.
6.fg3. Loses the wait-and-see move 6.bc5 gh4 7.fg3 h: f2 8.g: g5 gh6 9.gf6 e: g5   A strong bias of forces on the flanks (six checkers on the left flank and only one on the right) is the reason for White’s defeat. 10.hg3 de7 11.de3 ed6 12.c: e7 f: d6 13.gh4 gf4 14.e: g5 h: f4 15.de5 fe3 16.e: c7 b: d8x.
6 … bc5 7.d: b6 a: c7 8.g: e5 ed6,  then everything is forced:
9.cd4 d: f4 10.bc3 cb6 11.gf2 gh4 12.de3 f: d2 13.c: e1 ba5 14.bc5 ab4 15.cd6 de7 16.a: c5 ab6 17.c: a7 e: g1 18. ab8  with a draw ending.

No. 28.

1.ed2!
The main idea of ​​this move is to prevent 1 … cd6? because of 2.fe3 d: b4 3.ef4x. Bad 1.cd2 that suggests itself? cd6! How to call after 1 … gh6 2.ba3 cb6 3.de3 b: d4 4.e: c5 dc7 5.ed2 is discussed below (commentary to 2 … gf4).
2.bc3. White is forced to concede the center, because 2.ba3 d: b4 3.a: c5 gh6!
After 3 … dc7? white is reborn from the ashes:   4.de3! By creating two threats at once – cd6, ef4 and ed4, ed2. Black cannot reflect them with 4 … ed4 because of 5.hg3 d: b6 6.gf4 gh6 7.fe5x, and 4 … ef4 5.ed2 cd6 6.ed4 d: b4 7.hg3 f: h2 8.de5 f: d4 9.h: h8x.
4.dc3 dc7 5.cb4 cb6 6.ed2 b: d4 7.de3 dc3 8.b: d2 ab6 9.fg3 bc5x.
2 … d: b4 3.c: a5 ab6!
In the game P. Milovidov – M. Rakhunov (1980) it was played less accurately: 3 … gh6?  4.dc3? 
It was not so easy to find a draw chance, especially since an undermining with the transition to the endgame loomed ahead: 4.fe3! dc7 5.dc3 gf4 6.e: g5 h: f4 7.ed2 ed6 8.cb4 ab6   9.de3! f: d2 10.bc5 =.
4 … dc7? Inaccuracy again. The winning was 4 … gf4! 5.cb4 ab6 6.a: c7 d: b6 7.ba5 ed6 8.a: c7 d: b8x, but Black has already mapped out a spectacular ending.
5.hg3? Salvation still remained after 5.cb4 ab6 6.fe3 gf4 7.e: g5 h: f4 8.ed2 ed6 9.de3! f: d2 10.bc5 =, as already mentioned in the notes to 4.fe3.
5 … gf4 6.gh2 ab6 7.ed2 bc5   8.fe3 hg5. Deprived of the spirit of romanticism, the computer indicates another alternative – 8 … cb4 9.e: g5 h: f4 10.cd4 e: e1 11.g: g7 ef2 12.a: c3 ef6 13.g: e5 fd4x. Well, now the main action begins. 
9.cd4 e: e1 10.g: g7   ef6! 11.g: e5 cb4! 12.h: f6 (12.a: c3 e: a5 13.h: f6 cd6x) 12 … cd6! 13.e: c7 eh4 14.a: c3 h: f4x. Not an unmistakable, but flamboyant game!
4.a: c7 d: b6  . Then maybe 5.de3 gh6 6.fg3 gf4 7.e: g5 h: f4 8.ed2 bc5 9.gf2 cb4 10.fe3 bc3 11.d: b4 f: d2 12.bc5 dc1 13.cb6 ed6 14.ba7 ed4x …
1 … gh6. The strongest answer, after which a painstaking defense is required from White. After 1 … gf4 2.cd6 e: c5 3.fe3 a draw is not far off.
2.ba3 gf4.  After 2 … cb6 White has no problems with the equation: 3.de3 b: d4 4.e: c5 dc7 5.cd2   gf4 (5 … cb6 6.de3 b: d4 7.e: c5 gf4 8.ab4 fe3 9.f: d4 e: a5 10.gf2 =) 6.ab4 cb6 7.fe3 b: f2 8.g: g5 h: f4 9.bc5 ab6 10.c: a7 ed4 =.
3.ab4 cb6 4.ba5 b: d4 5.de3 f: d2 6.c: c5 ef4  Black has achieved a tangible advantage, but with the sacrifice of drafts, White equalizes the chances.
7.fg3 fe3 8.gf4 e: g5 9.hg3  dc7 10.gf2 cd6 11.fe3 d: b4 12.a: c3 ed6 13.cb4 ab6 14.ba5 bc5 15.gf4,  and black is forced to agree to a draw.
Let’s consider examples where the constructions being analyzed appear right in the opening.
No. 29.

1.ab4 de5 2.gh4 hg5 3.bc5.
After 3.hg3 Black should continue with 3 … ed4. In the game A. Kandaurov – Y. Andreev (1987) there was 3 … ba5 ?, and White developed a swift attack: 4.gh2 gh6 5.bc5 gf4 6.e: g5 h: f4 7.cd4 e: c3 8. g: g7 f: h6 9.d: b4 a: c3 10.bd4   cd6 11.ab2 d: b4 12.ba3 bc7 13.a: c5 cd6 14.cb2 d: b4 12.ba3, and black resigned due to the inevitable 12 … dc7 13.a: c5 cd6 14.fg3! d: b4 15.dc5 b: d6 16.hg5 h: f4 17.g: c7x.
3 … b: d4 4.e: c5.

White simple c5, like a breakwater, cuts the opponent’s forces from the first moves. It is premature for Black to occupy the f4 square because of fg3 with the unpleasant threat of cd4, so first he should shatter White’s center by attacking the c5 checker.
4 … cb6 5.de3 b: d4 6.e: c5 bc7 7.cd2 cb6 8.de3 b: d4 9.e: c5 dc7. Now after 10.ed2 the a1-b2-c3 column loses its strength, so White changes the plan.
10.fe3,  to which black can finally revive the play on the left flank.
10 … gf4 11.e: g5 gh6  Further, in the game M. Kiselev – M. Fazylov (1986) White played a blow, forcibly leading to a draw: 12.cb6 a: c5 13.ef2 h: f4 14.hg3 f: h2 15.hg5 f: h4 16.cd4 e : c3 17.b: f6 fg7 =. But they had the opportunity to throw the logs into the fire.
12.cd4! e: c3. In the line 12 … h: f4 13.bc3   cd6 (13 … fe3? 14.d: f2 cb6 15.ab2 b: d4 16.ed2 ed6 17.fg3x) 14.hg3 fh2 15.hg5 dd2 16. ec3 fh4 17.dd8 hg7 black should switch to the difficult endgame defense.
13.b: d4 h: f4 14.ab2 fe3 15.d: f2 cb6 16.ed2 b: d4 17.de3 dc3 18.b: d4 ed6. Having sacrificed a checker, black easily achieves a draw.
19.hg3 hg7 20.gf4 dc5 21.d: b6 a: c5 =.
No. 30.

1.cd4 fg5 2.bc3 gf4 3.e: g5 h: f4 4.g: e5 d: f4 5.ab2 ba5. As a rule, here they change to c5, after the made move White has an initiative.

6.fg3.  6.ab4 should be answered by 6 … ef6, preventing 7.fg3? ab6! 8.g: e5 bc5x. Weak 6 … gf6 7.fg3 hg7? (it was worth looking for salvation after 7 … fg7 8.g: e5 ed6) 8.g: e5 ed6 9.gf2 d: f4   10.bc5! (10.fg3? Ab6! 11.g: e5 bc5x, N. Kukuev – S. Vorontsov, 1914) 10 … de7 11.fg3 fg5 12.g: e5 ed6 13.c: e7 f: f4 14.ef2 gh4 15.dc5 with a winning position.
6 … ed6 7.g: e5 d: f4 8.gf2. 8.ab4 gf6 9.gf2 cd6 gives less problems (9 … hg7? 10.bc5 !, the position is discussed above in the notes to 6.fg3) 10.ba3 bc7 11.bc5 d: b4 12.a: c5 fe7 13.cb2 fe3 14.d: f4 cd6 =.
8 … fe7 9.ab4 gf6. After 9 … ef6 10.fe3 White retains the initiative.
10.fg3  hg7 11.g: e5 ed6 12.ef2 d: f4 13.bc5 de7 14.fg3. The familiar idea of ​​sacrifice takes place in the line 14.ba3 fg5 15.fg3 cd6 16.g: c7 b: b4 17.a: c5 gf4, and then everything is forced: 18.cb2 gf6 19.ba3 fg5 20.ab4 gh4 21.de5 f : d6 22.de3 de5 23.cd4 a: c3 24.d: d8 cb2 =.
14 … cd6 15.g: c7 b: b4. White has achieved a serious advantage, but will it be enough to win?
16.hg3.  Taking a checker is inappropriate (16.ba3 fg5 17.a: c5 gf4, etc. =, see the commentary to the 14th move), pressure in the center is much more active.
 16 … ed6! A hard-to-find move, kindly suggested by a computer. Otherwise, it’s completely sad.
17.dc5 gh6 18.c: a3 fe5 19.de3 dc5 20.ab4. 20.ef4 cd4 21.f: d6 ab6 22.c: e5 bc5 23.d: b4 a: a1 =.
20 … c: a3 21.ef4. White has rearranged and is preparing a breakthrough, but Black has an unobvious salvation.
21 … ab6 22.f: d6 hg5  White has an extra checker, his turn to move and two steps to the kings, but because of the zugzwang he has to put up with a draw.
Further, 23.gh4 gf4 24.de7 bc5 25.ed8 cb4 26.hg5 f: h6 27.cd4 bc3 28.dc7 c: a1 29.ce5 hg5 30.gh8 a: e5 31.h: c3 gf4 = can still follow .
No. 31.

1.cd4 ba5 2.dc3 de5 3.cd2 ed6 4.ab4 de7 5.ba3 ef4 6.g: e5 d: f4 7.e: g5 h: f4. In tournament practice, Black usually prefers to shoot into the corner, choosing an encirclement strategy, but White does not experience any particular problems. The battle on f4 leads to a much more meaningful game with an abundance of combinational possibilities.
8.bc5.
After 8.fg3 it is better for black to agree with the simplifications 8 … cb6 9.h: f4 bc5. Weaker 8 … ed6 9.g: e5 d: f4 10.gf2 cd6 (10 … cb6 11.fg3 fe5 12.d: f6 g: e5   13.cd4 e: c3 14.g: e5, and black all that remains is to go to the end after 14 … fg7 15.hg3 gf6 16.e: g7 h: f6 17.gf4 bc5 18.b: d6 fe5 19.d: b4 e: g3 20.de7 a: c3 21.ed8 gh2 22.da5) 11.bc5 d: b4 12.a: c5   fe5 (quickly loses 12 … bc7 13.fg3 fe5 14.d: f6 g: e5 15.cd6 cb6 16.de7 f: d6 17.cd4 e: c3 18.d: b4 a: c3 19.g: a5x) 13.d: f6 g: e5 14.ab2 bc7 (14 … hg7 15.ba3 fe7 16.cb4 a: c3 17.d: b4 ef6 18.ed2 gh6 19.ba5 fg5 20.dc3 gh4 21.ab4 bc7 22.cd4 e: c3 23.b: d2x) 15.cd6 cb6 16.fe3 e: c7 17.e: g5, and black remains with an unattractive position.

Black has two continuations. After the first one, they find themselves in a difficult situation and only achieve a draw with accurate play. In the second case, White should play cautiously.
A) 8 … fg5.
Now interesting tactical motives arise after 9.fe3 cb6 10.ef2.
On 10.gf2 Black has a draw possibility 10 … bc7 (10 … gf6? 11.fg3 fe5 12.d: d8 b: h4 because of 13.de7! F: d6 14.de3 f: b4 15.a: e7, and black cannot escape) 11.fg3   gh4 12.e: g5 h: f2! 13.e: g3 ab4 14.c: a5 cd6 15.a: e5 gf6 16.e: g7 h: f2 =.
10 … gh4 11.e: g5 h: f6 12.hg3. Further, 12 … fg5 looks like a logical continuation, and in order to avoid possible encirclement White can transfer the game to an equal ending 13.cb4 a: e1 14.gh4 e: g3 15.h: a5.
But the main beauty is hidden behind the screen of the move 12 … bc7  This seemingly unassuming move contains a tactical filling. So, after 13.gf4 Black has the “barrier” strike 13 … ab4! 14.c: a5 ed6 15.c: g5 bc5 16.d: d8 ab6 17.a: c7 fe7 18.d: f6 g: d8 19.gh6 with a draw ending. On 13.gh4 another saving combination follows 13 … ab4! 14.c: a5 cd6 15.a: e5 ab6 16.c: a7 ed6 17.e: c7 fg5 18.h: f6 g: b8 =. Does 13.fe3 lose immediately? fe5x, and an attempt to play for a win 13.ab2 fg5 14.gh4 is dangerous because of 14 … ef6 with an unpleasant threat fe5.
But White has a more energetic continuation.
9.ab4! Starting a combination spring in case of 9 … gh6?  10.de5! f: d6 11.cd4 a: e5 12.de3 d: b4 13.ef4 e: g3 14.f: d2x. 
9 … gf6  10.ab2. Doesn’t cause problems 10.fg3 hg7 11.g: e5 ed6 12.c: e7 f: f4 13.gf2 cd6 14.fg3 bc7 15.g: e5 d: f4 16.ef2 gh4 17.bc5 gh6   18.ab2 (18 .fe3 fe5 19.d: f6 hg3 20.e: g5 h: f4 =; 18.cd6 c: e5 19.dc5 fg5 20.ab2 ab6 21.c: a7 ab4 22.c: a5 ed4 =) 18 .. .fg5 19.fe3 cb6 20.cd6 hg3 21.de5   gh4 22.e: g5 h: d4 23.c: e5 bc5 24.h: f4 c: e7 =.
10 … cd6 11.fg3. Bypassing the masked trap 11.fe3?  gh4! 12.e: g5 fe5 13.d: d8 h: f6 14.d: h4 fe7 15.h: d8 hg7 16.c: e7 bc7 10.d: b6 a: d8x.
11 … de5 12.gh4  After capturing the h4 square, the pin in the center develops to White’s advantage, but hidden tactical resources save Black.
12 … fg7! The rearrangement is inadmissible: 12 … bc7? 13.ef2! fg7 14.de3! f: d2 15.c: e1 a: a1 16.fe3 e: c3 17.ed2 c: e1 18.ed4 a: e5 19.gf2 e: g3 20.h: e3x. 12 … hg7 is also followed by 13.ef2! (after 13.gf2 Black already plays a similar blow 13 … ed6 14.c: e7 f: d8, etc. with a draw) 14.de3! f: d2 15.c: e1 a: a1 16.fe3 e: c3 17.ed2 c: e1 18.ed4 a: e5 19.gf2 e: g3 20.h: b8x.
13.gf2. On 13.ef2 one should play 13 … ed6 14.c: e7 f: d8 15.d: f6 (15.h: f6? De7 16.f: d8 gh6 17.d: f6 fg3 followed by 18 … bc7x) 15 … g: e7 with equality, but not 13 … bc7? 14.de3! X as above.
13 … bc7  14.fg3.  14.fe3 ed6 15.c: e7 f: d8 16.d: f6 g: e7 17.e: g5 gh6, and because of the sieve on the left flank White is forced to part with an extra piece 18.bc5 h: f4 19.cd4 cd6 20.ba3 d: b4 21.a: c5 dc7 22.ef2 =.
14 … ed6 15.c: e7 f: d8 16.d: f6 g: e7 17.g: e5 ed6 18.ef2 d: f4  19.bc5. Chasing the checker 19.fg3? punishable: 19 … gh6 20.g: e5 hg5 21.h: f6 de7x. 
19 … de7 20.cd4  ef6 21.fg3 ab4! 22.c: a3 cd6 22.g: c7 fg5 23.h: f6 g: e1 =.
B) 8 … gh6 , and White’s attempt to catch on the above trap (9.ab4 fg5? 9.de5! X) will result in a defeat for him.
9.ab4?  9.fe3 was needed with a possible continuation 9 … hg7 10.e: g5 h: f4 11.gf2 fg5 12.ab2 gh4 13.fg3 h: f2 14.e: e5 ed6 15.c: e7 f: f4   16 .de3 (unexpectedly bad 16.ab4? cd6! 17.de5 ab6 18.e: g3 bc5x – J. Schmidt’s idea) 16 … f: b4 17.a: c5 =.
9 … hg7! Opposing 10.fg3 due to 10 … fg5 and 11 … ed6.
10.ab2 cd6 11.fg3 de5  The position is similar to the position from variation A, only the g7 and h6 checkers are located on g5 and h8. But it is precisely this small difference that radically changes the assessment of the position – White cannot play 12.gh4 because of 12 … fe3! 13.d: f2 ab6 14.c: a7 ed4 15.c: e5 a: a1x, you have to make an unnecessary move, losing an important tempo.
12.ba3 hg5 13.ef2.  After 13.gh4 gh6 White has no acceptable moves, and 3.gf2 gh6 14.fe3 gh4 15.e: g5 h: f4x loses.
13 … bc7 14.gh4 gh6 15.fg3 cd6 16.de3 f: d2 17.c: e1 e: c3 18.b: d2 d: b4 19.a: c5 fg7, winning the checker and the game.

Atbildēt