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Normal Topic a- and h-pawns versus h-pawn (Read 6438 times)
Poghosyan
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Re: a- and h-pawns versus h-pawn
Reply #6 - 09/28/12 at 08:22:02
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Rachels-Gurevich (rev. fl.)  
(continuation of post #3 - 09/21/12 at 19:13:16)

D. 2.8


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17.Kg4

White acknowledges at last that the transfer of his king to the kingside was wrong and returns it to the queenside. 
 
17…Kd6 18.Kf5 Kd7 19.Rb5 Kc7 20.Ke5

20.h5 was faster but White has the wrong idea to use the h5-square for his rook.   

20...Kc8 21.Rd5 Kc7 22.Kd4 Rf6 23.Kc5

Again 23.h5 was faster.  

23...Rf4

23...Ra6 24.Kb5 Rf6 25.Rc5+ Kb7 26.h5! transposes to the game Bondarevsky-Keres (D. 1.4).  

D. 2.9


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24.Rh5?

Again a result-changing error. 24.h5! was winning (recommended also by Dvoretsky as a strong move). 

24...Rf6? 

Giving up the pawn would have drawn - 24...Kb7 25.Rxh6 Ka7= (Dvoretsky).

25.Kb5?

25.Rd5 or 25.Re5 would have won.

25...Kb7 26.Re5

D. 2.10


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26…Rf4?

The only move to draw was 26...h5! 27.Rxh5 Rf4!=.

27.h5 Rf6 28.Re7+ Kb8

D. 2.11


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29.Rh7?

Dvoretsky gives rightly a question mark to this move and suggests 29.Rd7 Rf5+ 30.Kb6 Rf6+ 31.Kc5+- with transposition into the game after 35.Rd7.  

29...Re6?

“It was essential for Black to exploit his opponent’s mistake, by playing 29...Rf5+! 30.Kc6 Rf6+ (neither 30…Ra5? nor 31…Rh5? Is possible in view of 32.Kb6) 31Kd7 Rf5 (or – as recommended by Miles - 31...Ra6) 32.Rxh6 Rxa5 (or 32...Ka7=) with an obvious draw” (Dvoretsky).

D. 2.12


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30.Kc5

30.Rd7 was stronger with transposition to the analysis of Bondarevsky-Keres, D. 1.11 after 2.Rf5 Kc7 3.Rf7+ Kb8 4.Rd7. 

30...Re5+ 31.Kc6 Re6+ 32.Kd5 Rf6

Dvoretsky recommended 32...Ra6 in the Russian edition of his manual but it also loses.  

D. 2.13


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33.Kc5 Kc8! (33...Rf6 34.Rd7 transposes into the game after 35.Rd7) 34.Kb5 Rf6. Dvoretsky ends here but this position is won for White - 35.Rg7 Rf8 36.Kb6 Rf6+ 37.Ka7 Rc6 38.Rg6+-.  

33.Re7!

The only move to win.  

33...Ra6

After 33...Kc8 White wins by 34.Re6 Rf5+ 35.Kc6 Kb8 (35...Kd8 36.a6) 36.Kb6! (Dvoretsky).  

33...Ka8 was stronger but also loses. 

D. 2.14


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a) 34.Rd7! Kb8 35.Kc5! (transposes into the game after 35.Rd7).

b) 34.Re6 Rf5+ 35.Re5 (35.Kc6 Ka7) 35...Rf6 36.Kc5 Kb7 37.Rd5 Kc7. According to Dvoretsky the position is drawn but in fact White wins - 38.Re5 Kb7 39.Kb5+-.

34.Kc5 Rf6

34...Kc8 35.Kb5 Rf6 36.Rg7+- (Dvoretsky).  

35.Rd7

D. 2.15


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This position could have arisen in the game Bondarevsky-Keres, D. 1.5 in the line b) after 2…Rf6 3.Rd7+ Kb8.   

35...Rf5+ 36.Rd5

Not 36.Kc6? Rxa5 37.Kb6 Kc8= (Dvoretsky).

36…Rf1

“After 36...Rf6 37.Rd6 Rf1 White has a pleasant choice between 38.Kb6 and 38.Rxh6 Kc7 (unfortunately, 38...Ka7 is not possible because of 39.Rd6) 39.Rh7+ Kc8 40.Rh8+ Kc7 41.h6 Rf5+ 42.Kd4 Rf6 43.h7 Rh6 44.Ra8. The flank attack on the rook’s pawn only works if the king is on g7 or h7” (Dvoretsky).  

37.Kd6 Kb7 38.Ke6 Ka7 39.Rf5 Rg1 40.Kf6 Ka6 41.Re5 Rg2 42.Re7 Rg5 43.Re6+ Ka7 44.Re5 Rg1 45.Re7+ Ka6 46.Rg7 Rh1 47.Kg6 Kxa5 48.Kxh6 Kb6 49.Rg5 Kc7 50.Kg7 Rd1 51.h6 Rd7+ 52.Kg6 Rd6+ 53.Kh5. Black resigned.
  
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Re: a- and h-pawns versus h-pawn
Reply #5 - 09/23/12 at 16:43:41
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Mbourzut offers again an excellent and very difficult example (like Karjakin-Alexeev). 
Black’s decisive mistake was 53…Rg1? which allows White to penetrate with the king to the 5th rank. Black should have kept control on 5th rank. The question is – where shoul go the rook . to c5, d5 or a5? 53…Ra5 loses whereas 53…Rc5 or 53…Rd5 draw. The drawback of 53…Ra5 is that White manages to transfer his king to the queenside without much difficulties because the rook stands passive on a5. There seems to be an amazing mutual zugzwang position in the line 53…Ra5 54.Ke3 Kf6 55.Kd3 Kf5 56.Rd4 Ke6 (56…Ke5 57.Kc3) 57.Kc2 (not 57.Kc3 Ke5) 57…Ke5 58.Kc3. 

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White to play draws
Black to play loses
  
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Re: a- and h-pawns versus h-pawn
Reply #4 - 09/22/12 at 04:53:08
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Hard to believe, but this type of ending seems to be misplayed over 25% of the time!

The following position arose in Gdanski-Graf, 2005:

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Black obviously has to move his rook.  Where should it go, and why?
  
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Re: a- and h-pawns versus h-pawn
Reply #3 - 09/21/12 at 18:13:16
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D. 2

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Rachels-Gurevich (rev. fl.)
USA-ch 1989

M. Dvoretsky analysis this endgame in his Secrets of Endgame Technique (Russian edition of 1998 and English edition of 2008). The game was completely misplayed by both players - they committed 15 result-changing errors but only a couple of them have been taken notice of in the analysis of Dvoretsky.  

1...Kb6

Dvoretsky recommends 1...Rg2 2.Rxh6 Rf2 as the simplest way to draw. I. Odessky disagrees with this assertion (in 64, n. 1-2012) and points to the line 3.h4 Rf4 4.Rh5, where the only move to draw is 4…Ka6! This move is according to Odessky not so obvious but if one knows the main idea of White – to put his rook between his pawns - then to find 4…Ka6! is not that difficult.   

I think that best move here was 1...Ka6 – the king blocks the pawn and does not give White rook the possibility to switch with a check from b- or c-files to the 4th rank.  

2.a5+ Kc7?!

“A clear demonstration of Black`s ignorance of theory. Gurevich … incorrectly moves his king to the opposite wing” (Dvoretsky). 

Again 2…Ka6 is probably the most simple way to draw - 3.Kc4 Rg4+ 4.Kd3 Rb4 5.Ke3 Rb3+ 6.Kf4 Rb4+ 7.Kg3 Rb3+=. 

3.Kc4

D. 2.1

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3…Rf6 

Giving up the pawn by 3...Rg2? loses to 4.Rxh6 Rf2 5.h3! (the only move to win) 5...Rf4+ 6.Kb5 Rf5+ (6...Kb7 7.a6+ Ka7 8.Rc6 Rf3 9.h4 Rb3+ 10.Kc5 Rh3 11.Rh6+-) 7.Ka6+-.  

4.Kd5 Kd7

Black continues with his wrong plan. It was not to late to retreat with 4...Kb7 - 5.Ke5 Rc6 6.Rf5 Ra6 7.Kf4 Rc6 8.h4 Rc4+! 9.Kg3 Rc3+ or 9...h5 10.Rxh5 Rc3+ 11.Kf4 Rc4+=.

5.Ke5 Ra6 6.Kf4 

D. 2.2

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6…Ra8?

This move loses because White gets time to create the favourable set up with the pawn on a5 and h5 defended by the rook along the 5th rank. 

Black could have saved by 6...Rf6+, 6…Rc6 or 6...Rd6=.   

7.Rd5+ 

7.h4 is the most straightforward. 7…Ra6 8.Ke4 Rc6 9.Kd4 Rf6 10.Kc5 Kc7 with transposition into the game after 24...Rf6?   

7...Kc6 8.Rf5 Kd7 9.Kg4

Again 9.h4 was better but White has a wrong plan in mind.  

9...Ra6

D. 2.3

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10.Kh5? 

This throws away the win because gives the Black the possibility to activate again his rook. White could have won by 10.Rd5+ Kc6 11.Re5 Kd6 12.Rb5 Kc7 (12...Kc6 13.Rb6++-) 13.h4 Rg6+ 14.Kf5 Ra6+- with  transposition into the game after 19…Kc7. 
10.h4 also wins. 

10...Ke6?

Black fails to make use of the error of White. By activating the rook Black could have secured the draw.  10...Rc6 (10…Rd6, 10…Re6) or 10...Kc7 11.h4 Rc6 12.Kg4 Rc4+ 13.Kg3 Ra4=.

D. 2.4

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11.Rb5?

Again a result-changing error.  11.Kg6 was an easy win – 11…Ke7+ 12.Kg7 Ke8 13.Re5+ Kd7 14.Kf7+-.  

11...Kf7?

Returning the favour. 11...Kd7! was the only move to draw - 12.h4 Rc6 13.Kg4 Rc4+!=.

12.h4 Ke7

D. 2.5

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13.Rb7+?

This move again throws away the win because after the retreat of the king to the 8th rank the rook is obliged to come back to b5 after which Black can activate his rook. 
13.Kg4  Kd7 14.h5 was winning.  

13...Kf8?!  

13...Kd8 was better - 14.Rb5 Rc6 15.Kg4 Rc4+=. 

14.Rb5

D. 2.6

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14…Ke7?

Black misses again the opportunity to activate his rook. 14...Rc6 or 14...Re6 would draw. E.g. 14...Rc6 15.Kg4 Rc4+ 16.Kh5 (16.Kf5 Rxh4=) 16...Ra4=. 

D. 2.7

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15.Rf5?

White misses again the plan 15.Kg4 and 16.h5+-.

15...Ke8?

The same error by Black who blocks the pawn with the rook. 15...Rc6 16.Kg4 Re1 17.Rb5 Rc4+! 18.Kg3 Ra4   draws. 
 
16.Re5+ Kd7

(to be continued)
« Last Edit: 09/21/12 at 20:02:55 by Poghosyan »  
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Re: a- and h-pawns versus h-pawn
Reply #2 - 07/09/12 at 18:19:18
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Back to D. 1.4

II. 1...Rf8

This waiting move is here the most stubborn defence. 

2.Re5 Rf7 3.Rd5 

The same position arises after 1...Rf1 2.Re5 Kf7 3.Rd5. 
Black tries to keep control on 7. rank but in the long run this is impossible.  

D. 1.8  

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1) 3...Kc7 4.Rc5+ Kb7 5.Re5 Kc7 6.Kc5

D. 1.9

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a) 6...Rg7 7.Kd5 Kd7 

7...Rd7+ 8.Ke6+-.  

8.Rf5

D. 1.10

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Black does not have any useful move now. Any move of the Black king allows the penetration of the White king to the 6. rank. 

8…Re7 9.Rf6

Now when Black rook does not have the possibility to give a check from the 5. rank the Whitr rooks can go the 6 rank. 

9…Rg7 10.Rg6 Rf7 11.a6 Rf5+ 12.Ke4 Ra5 13.a7 Kc7 14.Rg8 Rxa7 15.Rg7+ Kb6 16.Rxa7 Kxa7 17.Kf5+-. 

Back to D. 1.9 

b) 6...Kb7 7.Kd6 Rf6+ 8.Ke7 Rf1 9.Ke6 Ka7 10.Rf5 Re1+ 11.Kf7 Rg1 12.Re5 

Not 12.Rf6? Rg5 13.Rxh6 Rc5!=. 

12...Rg2 

12...Ka6 13.Re6+ Kxa5 14.Rxh6+-. 

13.Re7+ Ka6

13...Ka8 14.Re6+-. 

14.Re6+ Kxa5 15.Rxh6+-. 

Back to D. 1.9 

c) 6...Kd7 7.Kb6 Rf6+ 8.Kb7+-. 

Back to D. 1.9 

d) 6...Rf6 7.Re7+ Kb8 

7...Kc8 8.Rg7 Rf5+ 9.Kb6 Rf6+ 10.Ka7+-.

8.Rd7+-. Transposition into the game Rachels-Gurevich after 35.Rd7.

Not 8.Rg7? Rf5+ 9.Kb6 Rf6+ 10.Kc5 Rf5+ 11.Kc6 Rxh5=.  

Back to D. 1.1

2) 3...Rc7 4.Rf5 Re7 5.Kc5 

D. 1.11

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a) 5...Kc7 6.Kd5 Re1 7.Rf7+ Kb8 8.Rf6+-. 

b) 5...Rd7 6.Rd5 Rc7+ 7.Kd6+-. 

c) 5...Re6 6.Rf7+ Kb8 transposes to III.1…Re6 after 2.Rf5 Kc7 3.Rf7+ Kb8.  

III. 1...Re6

D. 1.11

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2.Rf5

a) 2...Kc7 3.Rf7+ Kb8 4.Rd7 Re5+ 5.Kb6 Re6+ 6.Kc5   

D. 1.12

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6...Re1 7.Kc6 Ka8 

7...Rc1+ 8.Kb6 Rb1+ 9.Ka6 Rf1 10.Rb7+ Kc8 (10...Ka8 11.Rb6+-) 11.Ka7+-.

8.Rd5

8.Rd6 Ka7 9.Rxh6? Re5!=.

8...Rc1+ 9.Kd7 Re1 10.Kd6 Ka7 11.Re5 Ra1 12.Ke6+-.  

b) 2...Ka8 3.Rf7 Re5+ 

3...Kb8 4.Rd7 transposes to the previous line a) after 4.Rd7.  

4.Kc6 Re6+ 5.Kd5 Ra6 6.Kc5 Re6 7.Rc7 Re8 8.Rc6 Kb7 9.Kd5 Rf8 10.a6+ Ka7 11.Ke5! Rg8 12.Rg6! Rc8 13.Kf6 Rc5

D. 1.13

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14.Rg7+! Kxa6 15.Kg6! Rc6+ 16.Kh7!+-.  

c) 2...Kc8 3.Rf7 Kb8 4.Rd7 transposes to the line a) after 4.Rd7.  

d) 2…Re7 3.Kc5 transposes to D. 1.11.
  
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Re: a- and h-pawns versus h-pawn
Reply #1 - 07/06/12 at 17:22:46
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a- and h-pawns versus h-pawn
07/06/12 at 17:22:08
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Part 1

The structure a- and h-pawns versus h-pawn is generally favourable for the defender because losing the pawn does not lead automatically to a lost position. Liquidation to a drawn position without a pawn is often the only drawing strategy achieving a Vancura-type draw. 

D. 1

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Bondarevsky – Keres 
Chigorin Memorial Moscow, 1947

This endgame has not been extensively studied by the endgame theory. Lilienthal and Flohr commented this game in the Byulleten of Chigorin memorial and did not see any mistakes after the liquidation to the rook ending. M. Kamyshov who was extremely critical to the play of both partners until the 67. move also believed that the draw was the natural result in this ending. Euwe and Hooper included this ending in their “A Guide to Chess Endings” as an illustration of weakness of rook pawns (n. 259, p. 178). In fact, this position is winning for White. 

74.Ra7?

This move throws away the win. White should have immediately activated his rook placing it behind his pawn. 
74.Rd4+ Kf5 75.Ra4 Ra6. This position arose later in the game after 83…Kf5. 

D. 1.1

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74...Kf3?!

Black misses the opportunity to bring his rook to an active position by 74...Re5 75.a6 Ra5. If 76.Ra8 then 76…Rf5! 

75.Kh3

D. 1.2

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75…Kf4?

This move loses. Here 75...Re5! was already necessary. 76.Rf7+ Ke4 77.a6 Ra5 78.Rf6 h5 79.Kg3 Ra2=. 

76.Rb7 Ra6 77.Rb5 Kf3 78.Kh4 Kf4 79.Rb4+ Kf3 80.Ra4 Kg2 81.Ra2+ Kf3

According to Euwe/Hooper this position is drawn because White has rook's pawns and despite the fact that Black's rook is badly placed in front of the passed pawn. 

82.Ra3+ Ke4 83.Ra4+ Kf5

D. 1.3

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84.Kh5

White’s king should go the queen’s side to support the a-pawn. 84.Kg3 was better – 84...Rg6+ 85.Kf3 Ra6 86.Ke3+-

84...Ke5 85.Kg4 Ke6 86.Kf4 Kf6 87.Ke4 Ke6 88.Ra3 Ke7 89.Ke5 Ke8

Black's answer to White's tempo moves. Not   89...Kf7 90.Kd5 Ke7 91.Kc5 Kd7 92.Kb5 Rf6 93.a6 (Euwe/Hooper). 

90.h4 Ke7 91.Kd5 Kd7 92.h5 Kd8 93.Kc5 Kc7 94.Kb5 Rf6

Not  94...Kb7 95.Rg3 Rf6 96.Rg7+ driving Black's king to the back rank 96...Kc8 97.Rg6 Rf5+ 98.Kc6 Kb8 99.Kb6 Kc8 100.Rxh6 (Euwe/Hooper ).  

95.Rc3+! Kb7 96.Rc5

D. 1.4

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*

This is a critical position which has been considered by annotators as drawn. In fact, the position is winning for White. 

I. 96...Rf1

We shall consider here in detail 97.a6+? (1) played by Bondarevsky and 97(2.)Rd5 (2). 
2.Re5 Rf7 (2...Rb1+ 3.Kc5 Rd1 (3...Rc1+ 4.Kd6 Rc6+ 5.Ke7+-) 4.Re7+ Ka6 5.Re6+ Kxa5 6.Rxh6+-) 3.Rd5 transposes into D. 1.8.

1) 2.a6+? Ka7

D. 1.5

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This position is drawn because Black can achieve the Vancura position where the h-pawn does not play any role. 

98.Rc7+ Kb8 99.Rc6 Ka7 100.Rxh6 Rf5+! 101.Kc4 Re5 102.Kd4 Rg5 103.Ke4 Rc5 104.Kd4 Rg5 105.Rh8 Rf5. Draw agreed. 

2) 2.Rd5

D. 1.6

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Now the 7. rank defence - 2...Rf7 3.Kc5 Kc7 (3...Re7 4.Kd6 Re1 5.Re5+-) 4.Re5+- transposes into D. 1.9.

a) 2...Kc7 3.Re5 Kb7

3...Rf8 4.Re7+ Kb8 5.Rd7 Rf5+ 6.Kb6 Rf6+ 7.Kc5 transposition into the the game Rachels-Gurevich (D. 2) after 35.Rd7. 

4.Re7+ Kb8 5.Rd7 Rf8 6.Kc6 Ka8 7.Rd5 Kb8 8.Kd7 Rf6 9.Ke7 Rc6

D. 1.7

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10.Rf5

Not 10.Rd6? Rc5!

10.Kf7?!  is premature. After 10…Kc8 11.Kg7 Ra6 12.Rf5 Kd7 the king has to come back - 13.Kf7 (13.Rf6? Rxa5=) 13...Rc6 14.Rd5+ Kc8 15.Ke7 Kb8.  

10...Kc8 11.Re5 Kc7

11...Kb7 12.Kf7 Ra6 13.Rc5 Kb8 14.Kg7 Kb7 15.Rf5+-.

12.Rb5 Rc1

12...Kc8 13.Rb6 Rc5 14.a6+-. 

13.a6 Rc6 14.Ra5 Kb8 15.Kf7 Rc7+ 16.Kg6 Rc6+ 17.Kg7 Ka7 18.Rf5 Kb8 19.Rf6 Rc1 20.Kxh6+-.

Not 20.Rxh6? Rc5= (20...Rc7+=). 

b) 2...Rf6 3.Rd7+ Kc8

3…Kb8 transposes into into the the game Rachels-Gurevich (D. 2) after 35.Rd7. 

4.Rg7 Rf8 

a) 4...Rf5+ 5.Kb6 (5.Kc6?!+-) 5...Rf6+ (5...Rf8 6.Ka7 Rf5 7.a6 Rxh5 8.Kb6 Rh1 9.Rg8+ Kd7 10.a7+-) 6.Ka7 Rc6 7.Rg6 Rc7+ 8.Ka8 Rc5 9.a6+-. 
b) 4...Kb8 5.Rg6 Rf1 6.Rxh6.

5.Kb6 Kb8 6.Rg6 Rh8 7.Rd6 Ka8 8.Kc7 Ka7 9.Rd8 Rh7+ 10.Kc6 Rb7 11.Rd7 Ka8 12.Rd6 Rb1 13.Rxh6+-.
  
Bondarevsky-Keres.pgn ( 2 KB | Downloads )
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