Extra Positions: position X05

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Overview Unsolved Positions

The Extra Positions are taken from some book reviews by Valentin Albillo. Apart from those 5 extra positions, he also proposed some mate problems, intended for special purpose mate solving programs.
As the positions are mostly not selected to test programs on, the "solutions" often are refuted by modern hard- and software.



X05.Black wins

1.Rxh2(?) wins
FEN: r1b2k1r/ppppq1p1/6p1/2b5/2Bnn3/2N5/PPPP1PPP/R1BQ1RK1 b - - 0 1

Black to play and win with... 1.Rxh2(?)


Results
Program GUI+Hash Hardware Move 1st value & time 1st ply & kns 2nd value & time 2nd ply & kns 3rd value & time 3rd ply & kns
Fruit2.1 Shredder7 GUI 128MB AMD Athlon XP2200+ 256MB 1.e2-e4 +31.28 13/30 00:03:07 68.974 kns

Comments

Here, the game is not about finding the best move first - because what is the best move here? - but about finding the path to mate. The programs all give 1.e4 as best move, but that still does not mean that this is the start of the fastest mating method.

Fruit2.1 tried hard and got to +42.58, but no mate was found. When running down the analysis, it's very close to finding the mate, but it is not displayed. 47: Albillo X05 - 1..Rxh2 (1..Qe5), -+ 2003 r1b2k1r/ppppq1p1/6p1/2b5/2Bnn3/2N5/PPPP1PPP/R1BQ1RK1 b - - 0 1 Analysis by Fruit 2.1: 1...Qe5 -+ (-2.42) Depth: 1/3 00:00:00 1...Qe5 2.g3 -+ (-1.79) Depth: 2/9 00:00:00 1...Qh4 2.h3 -+ (-1.82) Depth: 2/9 00:00:00 1...Qh4 2.h3 Rh5 3.Nxe4 Qxe4 -+ (-1.84) Depth: 3/12 00:00:00 1...Qe5 2.g3 Rh5 -+ (-2.28) Depth: 3/12 00:00:00 1...Rxh2 2.g3 Rh5 -+ (-3.39) Depth: 3/12 00:00:00 1...Rxh2 2.g3 Rh5 3.Re1 -+ (-2.96) Depth: 4/12 00:00:00 1...Rxh2 2.g3 Rh6 3.Qg4 Nxc2 4.Qxe4 Nxa1 -+ (-3.33) Depth: 5/16 00:00:00 1...Rxh2 2.g3 Rh5 3.Nd5 Qf7 4.Nf4 -+ (-3.31) Depth: 6/22 00:00:00 27kN 1...Qe5 2.g3 d5 3.Re1 Qf6 4.Nxe4 Nf3+ 5.Kf1 Nxh2+ 6.Kg1 dxe4 -+ (-3.35) Depth: 6/22 00:00:00 34kN 1...Qe5 2.g3 Qf5 3.h4 Nf3+ 4.Qxf3 Qxf3 5.Nxe4 Qxe4 6.d3 -+ (-9.06) Depth: 7/22 00:00:00 65kN 1...Qe5 2.g3 Qf5 3.h4 Nf3+ 4.Qxf3 Qxf3 5.Nxe4 Qxe4 6.d3 Qe2 -+ (-9.13) Depth: 8/22 00:00:00 82kN 1...Qe5 2.g3 Qf5 3.h4 Nf3+ 4.Qxf3 Qxf3 5.Nxe4 Qxe4 6.d3 Qe2 7.Be3 Bxe3 8.fxe3+ Ke7 -+ (-8.32) Depth: 9/25 00:00:00 127kN 1...Qe5 2.h3 Ng5 3.Bd5 d6 4.d3 Ndf3+ 5.Qxf3+ Nxf3+ 6.Bxf3 Rxh3 7.Bf4 Qxf4 8.gxh3 Qxf3 -+ (-9.25) Depth: 10/30 00:00:01 510kN 1...Qe5 2.h3 Ng5 3.Bd5 d6 4.d3 Ndf3+ 5.Qxf3+ Nxf3+ 6.Bxf3 Rxh3 7.Bf4 Qxf4 8.gxh3 Qxf3 -+ (-9.25) Depth: 11/30 00:00:02 1115kN 1...Qe5 2.g3 Qf5 3.h4 Nf3+ 4.Qxf3 Qxf3 5.Nxe4 Qxe4 6.d3 Qe5 7.Be3 Bxe3 8.fxe3+ Ke8 9.Kg2 Qxb2 -+ (-9.13) Depth: 12/30 00:00:02 1131kN 1...Qe5 2.g3 Qf5 3.h4 Nf3+ 4.Qxf3 Qxf3 5.Nxe4 Qxe4 6.d3 Qe5 7.Be3 Bxe3 8.fxe3+ Ke8 9.Kg2 Qxb2 -+ (-9.13) Depth: 13/30 00:00:02 1153kN 1...Qe5 2.h3 Ng5 3.Bd5 d6 4.Re1 Nxh3+ 5.gxh3 Qg5+ 6.Qg4 Bxg4 7.d3 Qh4 8.Re3 Nxc2 9.Bxb7 Nxe3 10.Bxa8 -+ (-11.17) Depth: 14/67 00:17:10 697920kN 1...d6 2.Nxe4 Qh4 3.h3 Bxh3 4.Nxc5 Bxg2 5.f3 Qh2+ 6.Kf2 Bxf1+ 7.Kxf1 dxc5 8.Bd5 Qh1+ 9.Kf2 Rh2+ 10.Ke3 Re8+ 11.Be4 Nxc2+ 12.Kf4 Qxd1 -+ (-15.18) Depth: 14/72 00:48:22 1802328kN (Surmont, Roeselare 25.06.2006)



(c) Yves Surmont 2006 (source material: Valentin Albillo, 1997)