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Normal Topic Krakops-Dautov (DEM 9-166 Notes) f4 lines (Read 3377 times)
Poghosyan V
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Re: Krakops-Dautov (DEM 9-166 Notes) f4 lines
Reply #1 - 04/27/14 at 09:22:43
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Since it has been proved recently that in the Kantorovich position the Aagaards plan also secures a draw it is quite natural that in Krakops-Dautov Black can draw in the line 5f6! 6.Ra7+ Kh6 7.a6 g5 8.Ra8 Kg6! As demonstrated in the analysis of Aagaard plan the premature gh4 is losing in several lines. I am particularly impressed by the line 6.f4 g5! (instead of 6Ra3?) which seems indeed to guarantee a draw.

As to the mistakes in the line 6.f4 Ra3 7.Ra7+ Kh6 8.a6! g5 9.f5? some of them were already detected 2011-2012. I reported end of December 2011 to M. Dvoretsky that 9Rxg3 does not lose because of 11Ra4+! This line is given also in my posting Re: Regarding Bacrot-Robson Reply #34 - 11/11/11 at 17:33:02. In his reply with a revised version of the chapter of his manual M. Dvoretsky pointed out to the possibility of 11Rc4+! 12.Kd6 Rxh4= in the line 9.f5? gxh4 10.gxh4 Ra4+ 11.Kc5.

But some improvements of John_Hall in the line 6.f4 Ra3 7.Ra7+ Kh6 8.a6! g5 9.f5? are new. In the line 9.Ra8! gxh4 10.gxh4 Kg6 11.Kc5 Kf5 12.Kb6 Rb3+ 13.Ka7 Kxf4 14.Rb8 the move of John_Hall 14Re3! (instead of 14Ra3) guarantees a draw. It is very similar to the main line of my recent analysis of Aagaard plan after 9.Ka7 Re2 (with the irrelevant difference that there the Black king is on f3). Also the possibility of 12.Kb5! (instead of 12.Kb6) had been overlooked both by me and Dvoretsky in our correspondence.

The analysis of John_Hall of Krakops-Dautov gives me a good occasion to come back to the study of positions with the passed pawn on a5 (see the forthcoming thread New findings in rook endings 4 versus 3 with the passed pawn on a5).
  
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John_Hall
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Krakops-Dautov (DEM 9-166 Notes) f4 lines
04/20/14 at 16:36:58
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Akopian-Kir. Georgiev (DEM 9-166)
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After 1Ra1?! 2.Ra6! Ra2 3.a4 Ra3+?! 4.Kd4 Ra2 5.a5 f6

Krakops-Dautov (reversed)
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Dvoretsky gives win 6.Ra7+ Kh6 7.a6 g5 8.Ra8 gxh4? but I mentioned in gxh4 thread 8...Kg6! delaying h4 capture draws.
Dautov won with 6.f4 Ra3 7.Ra7+ Kh6 8.a6! g5 9.f5? gxh4 10.gxh4 Ra4+ 11.Kc5 Rxh4? 12.Ra8 Ra4 13.a7+-
Black could have drawn with 11Rc4+! 12.Kd6 Rxh4= and 9Rxg3 (? DEM) also draws 10.Ra8 Ra3 11.a7 Ra4+! (not 11Kg7? 12.fxg5+-) 12.Kc3 gxh4! 13.Rh8+ Kg5=
Dvoretsky gives an earlier White win with 9.Ra8! gxh4 10.gxh4 Kg6 11.Kc5 Kf5 12.Kb6 Rb3+ 13.Ka7 Kxf4 14.Rb8 Ra3 15.Rb5! Kg4 16.Kb6+-
Here instead of 14Ra3? there is 14Re3! drawing but K-b6-a7? is wrong plan, White can exploit proximity of black rook
White wins by 12.Kb5! Ra1 (12Kxf4 13.Rc8+-, 12Kg4 13.Rg8+ Kxh4 14.f5 Rb3+ 15.Ka4 Rb1 16.Rg7+-, 12Rb3+ 13.Ka4 Rb1 14.Rh8!+-)
13.Rh8! Rb1+ (13Kg4 14.Rh6!+-) 14.Kc6 Rc1+ 15.Kb7 Rb1+ 16.Ka8 Kg4 17.a7 Kxh4 18.Rb8 Ra1 19.Rb6 f5 20.Kb7+-

However Black can improve even earlier. First lets look at a slightly different move order 6.Ra7+ Kh6 7.f4
Now 7Ra3? leads to 8.a6! g5 9.Ra8! loss above so lets try 7g5 immediately since if 8.a6 or 8.Ra8 then 8gxh4 9.gxh4 Kg6= (saved tempo on Ra2-a3 and Ra2 further away from WK)
After 8.hxg5+ (8.f5 gxh4 9.gxh4 Ra4+=) fxg5 9.fxg5+ (9.f5 h4! draws) Kxg5 tablebase gives 10.Kc4 winning
However instead of 9Kxg5? Black plays 9Kg6! (intending R-a3-xg3) 10.a6 Ra3 11.Ra8 Kg7! and White can only stop Rxg3= with 12.a7 but then he lacks f-pawn to deflect BK from g7/h7 so drawn

So Black needs to attack g3 but should advance g5 first and not recapture g5 doubled pawn since White can then defend g3 with Rg7/g8!
Therefore 6.f4 g5! (instead of 6Ra3?) 7.hxg5 (7.f5 Ra3! 8.hxg5 fxg5 9.Rg6+ Kf7 10.Rxg5 Rxa5 11.Rxh5 Ra3=) fxg5 8.fxg5 (8.f5 h4!=) Ra3! draws
After 6.f4 g5! White can also try 7.Ke4 gxh4 8.gxh4 Rh2 9.Kf5 Rxh4 10.Ra7+ Kh6! 11.Ra8 Kg7 12.a6 when 12Rh3! 13.Ra7+ Kh6 14.Kxf6 (14.Rf7 Ra3 15.Rxf6+ Kg7=) Rf3! 15.Kf5 Ra3 16.Ra8 h4 17.a7 Kg7 18.Kg4 h3 (guarded by Ra3!) draws
Or 9.Rb6 Rxh4 10.Rb7+ Kg6 11.Rb3 Rh1 12.Rg3+ Kf7 13.Ra3 Re1+ 14.Kf3 (14.Kf5 Re7 15.a6 Ra7 16.Ra2 Ke7 17.Re2+ Kf7 18.Re6 h4 19.Rxf6+ Kg7 20.Rg6+ Kf7 21.Rb6 h3=)
14... Re7 15.a6 Ra7 16.f5 (16.Kg3 f5=) Kg7 17.Kg3 Kh6 18.Kh4 looks like win by zugzwang but Black does not have to move king eg. 18Rd7 19.a7?! Rxa7! 20.Rxa7 stalemate so drawn!

So the Dautov 6.f4 line, like Dvoretsky's 6.Ra7+ line, can be defended for a draw.
  
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