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Normal Topic New findings in rook endings 4 vers 3 with a5 pawn (Read 2780 times)
Poghosyan V
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New findings in rook endings 4 vers 3 with a5 pawn
05/11/14 at 13:36:33
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New findings in rook endings 4 versus 3 with the passed pawn on a5

D. 1

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John_Hall has demonstrated very convincingly that in Krakops-Dautov 1999 (rev. col.) after 1.Ke4 Ra2 2.Kd4 the move 2...f6 draws. It is the only way to draw. According to DEM the more principled continuation 2…Rf2 loses. I agree with this assessment but, as I found 2011, White has to choose a slightly different way to win. As reported by M. Dvoretsky in January 2012 these corrections had been taken into account for the next edition of his manual.

D. 1a

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After 3.Rc6 Rg2 White has to choose the right move order. According to GM Dautov white wins by 4.Rc3? (!! in DEM) 4…Ra2 5.Rc5 Ra3 6.Kc4 Rxg3 7.a6 Ra3 8.Kb5, but Black can draw by 6…f5 or immediately 5…f5. The only way to win is 4.a6! Rxg3 5.Rc3! Rg4+ 6.Kc5 Ra4 7.Kb5 Ra1 8.Rc5 f5 with transposition to DEM 9–171 with the Black rook on a3. The rest of analysis of Dautov is precise - 9.Rc7+ Kf6 10.a7 Ke6 11.Rc6+ Kd5 12.Ra6 Rb1+ 13.Ka5 Kc5 14.Rc6+ Kd5 15.Rxg6 Ra1+
16.Kb6 Ke4 17.Kb7 Rxa7+ 18.Kxa7
+–.

Since the overall conclusion after the fine analysis of John_Hall is that D. 1 after 1.Ke4 Ra2 2.Kd4 f6 is drawn one should not come to the conclusion that cutting off the Black king from 6th rank with the pawn still on a5 is always safe for Black. As I try to show in Krakops-Dautov White has an improvement one move earlier. 
 
In D. 1 after 1.Ke4 Ra2

D. 2

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2.Kd4? is a result-changing mistake while White wins by 2.f4! My main line is 2…Ra3 3.Kd5 Rxg3 4.Rc6 Rg4 5.a6 Rxf4 6.Rc4 Rf1 7.Ra4 Rd1+ 8.Kc6 Rc1+ 9.Kb5 Rc8 10.a7 Ra8 11.Kb6 g5 12.Kb7 Rd8 13.a8Q Rxa8 14.Rxa8+–.   

D. 3

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This very important position arose in the game Dautov-Alterman 1998 with Black to play. Although it is less favourable for each side to move first it is not a zugzwang position. According to the theory White wins but I think that the position is drawn. Alterman played 1…Ra4? and lost quickly. 1…Kf8 offers more resistance, although White can win by 2.f4. In my opinion Black saves by 1…f6! which is the only move to draw.  2.Ra7+ Kh6 3.a6 g5 4.Ra8 Kg7 5.f4 gxh4 6.gxh4 Ra1 7.Kd5 Kg6 8.Kc6 Kf5 9.Kb7 Rb1+ 10.Ka7 Kxf4 11.Rb8 Re1=.

The defence in D. 3 is easier when White is move.

D. 3a

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If 1.f4 Rg3 (D. 4, Rozentalis-Kindermann), if 1.Ra8 f6 (D. 5, Lerner-Dorfman). 

D. 4

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Rozentalis-Kindermann 2008, Shumiakina-Mashinskaya 2002.

D. 5

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Lerner-Dorfman 1980

Dorfman played here 58…Ra4+? which loses (see DEM, 9.163, my thread “TN in the ending Lerner-Dorfman ”). Dvoretsky recommends 58…Kf6 which draws but I think that the most straightforward plan here is 58…f6.
  

a5_ChessPub.pgn ( 49 KB | Downloads )
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