First prize for studies in Šachová skladba 2011-12.

[Ajedrecista]

Hello to everybody:

I found a very interesting endgame study just by chance: the first prize for studies in Šachová skladba 2011-12 (by Ladislav Salai Jr.). Here are the links I followed:

EVComp News
The John and Sue Beasley WebSite
Orthodox chess endgame studies (John)

A classic modern endgame study

The last link contains the study itself. Starting position of the study:

[d]4K1k1/8/1p5p/1Pp3b1/8/1P3P2/P1B2P2/8 w - -

Is there any engine that gives the correct line AND also gives a winning score? It is the same for me if Multi-PV is on or off. The closest I came was with Houdini: it saw the correct line but only showed a +0.50 eval at depth 25 or so, ranking 8th out of the 12 possible moves.

[pgn][Event "Šachová skladba 2011-12"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1-0"]
[SetUp "1"]
[FEN "4K1k1/8/1p5p/1Pp3b1/8/1P3P2/P1B2P2/8 w - - 0 1"]

1. f4 Bxf4 2. Kd7 Bd2 3. Kc6 Ba5 4. b4 cxb4 5. Bb3+ Kg7 6. Kd5 Kf6 7. Ke4 h5 8. Kf4 Kg6 9. Ke5 h4 10. Kf4 Kh5 11. f3[/pgn]

I am also curious about the eval of the position after 11.- f3. Possibly a checkmate in slightly less than 20 moves just toying a little with Houdini.

Who said than opposite coloured bishops endings were boring and drawish?

Regards from Spain.

Ajedrecista.

[Vinvin]

in 5-best-moves mode, Sting-SF-4.7 locks on 1.f4 after 47 seconds Intel 3.1 Ghz, 1 thread.

FEN: 4K1k1/8/1p5p/1Pp3b1/8/1P3P2/P1B2P2/8 w - - 0 1

Sting-sf-47:
...
21/60 00:31 37.643k 1.202k +1,33 1.a3 h5 2.Rd7 h4 3.Ff5 Ff6 4.Rc6 Fd4 5.a4 Rf7 6.a5 bxa5 7.Rd5 Re7 8.b6 Rd8 9.Rc6 Fxf2 10.b7 Fg3 11.Fg4 Fb8 12.Ff5 Ff4 13.Fe6 Fg3 14.Fg4
21/60 00:31 37.643k 1.202k +1,65 1.a4 Fd2 2.f4 Rg7 3.Re7 Fxf4 4.a5 bxa5 5.b6 h5 6.Fe4 h4 7.Fg2 Fb8 8.Fh3 Ff4 9.Re6 Fb8 10.Rd5 Rf6 11.b7 Re7 12.Rxc5 Rd8 13.Rb6 Re7 14.Rxa5
21/60 00:31 37.643k 1.202k +1,93 1.Rd7 Fd2 2.Rc7 Fa5 3.a3 Rf7 4.b4 cxb4 5.axb4 Fxb4 6.Rxb6 Re6 7.Rc6 Fe1 8.b6 Fxf2 9.b7 Fg3 10.Fg6 Fb8 11.Rb6 Re7 12.Fh5 Rd8 13.Fg4 Re7 14.Rb5 Rd6 15.f4 Rc7 16.Ra6 Rd6 17.f5
21/60 00:31 37.643k 1.202k +1,97 1.f4 Fxf4 2.Rd7 Fd2 3.Rc6 Fa5 4.b4 cxb4 5.Fb3+ Rg7 6.Rd5 Rf6 7.Re4 Re7 8.Re5 h5 9.Rf5 h4 10.Rg4 Rf6 11.Rxh4 Rf5 12.Rg3 Re4 13.f4 Rf5 14.Rf3 Rf6 15.Rg4 Re7 16.Rg5 Rd7 17.f5 Re7 18.f6+ Re8 19.Fd5
21/60 00:31 37.643k 1.202k +2,06 1.Ff5 Fd2 2.Rd7 Fa5 3.Rc6 Rf7 4.a3 h5 5.b4 cxb4 6.axb4 Fxb4 7.Rxb6 Re7 8.Rc6 Fd6 9.b6 Fe5 10.b7 Rd8 11.Fe6 h4 12.Fg4 Fc7 13.Fh3 Fe5 14.Ff5 Ff4 15.Fe6 Fb8 16.Ff5 Fe5 17.Fg4
---------------------------------------------------------------------------
22/60 00:47 59.632k 1.249k +1,33 1.a3 h5 2.Rd7 h4 3.Ff5 Ff6 4.Rc6 Fd4 5.a4 Rf7 6.a5 bxa5 7.Rd5 Re7 8.b6 Rd8 9.Rc6 Fxf2 10.b7 Fg3 11.Fg4 Fb8 12.Ff5 Ff4 13.Fe6 Fg3 14.Fg4
22/60 00:47 59.632k 1.249k +1,45 1.a4 Fd2 2.f4 Rg7 3.Re7 Fxf4 4.a5 bxa5 5.b6 h5 6.Re6 h4 7.Rf5 Fb8 8.Rg4 Rf6 9.Rxh4 Re6 10.b7 Rd7 11.Rg5 Rc7 12.f4 Rxb7 13.f5 Rc7 14.f6 Rc6 15.f7 Fd6 16.Ff5 Ff8 17.Rf6
22/60 00:47 59.632k 1.249k +1,93 1.Ff5 h5 2.Rd7 Fh4 3.Rc7 c4 4.Rxb6 Fxf2+ 5.Rc7 c3 6.b6 h4 7.b7 Fg3+ 8.Rc8 Rg7 9.b8£ Fxb8 10.Rxb8 Rf6 11.Fe4 h3
22/60 00:47 59.632k 1.249k +2,06 1.Rd7 Fd2 2.Ff5 Fa5 3.Rc6 Rf7 4.a3 h5 5.b4 cxb4 6.axb4 Fxb4 7.Rxb6 Re7 8.Rc6 Fd6 9.b6 Fe5 10.b7 Rd8 11.Fe6 h4 12.Fg4 Fc7 13.Fh3 Fe5 14.Ff5 Ff4 15.Fe6 Fb8 16.Ff5
22/60 00:47 59.632k 1.249k +2,34 1.f4 Fxf4 2.Rd7 Fd2 3.Rc6 Fa5 4.b4 cxb4 5.Fb3+ Rg7 6.Rd5 Rf6 7.Re4 h5 8.Rf4 Rg6 9.Re5 h4 10.Rf4 Rf6 11.f3 h3 12.Rg3 Rf5 13.Rxh3 Rf4 14.Rg2 Re5 15.Rg3 Rf6 16.Rg4 Re5 17.f4+ Rf6 18.f5 Re7 19.Rg5 Rd6 20.f6