Endgame blunder costs Arasan a win

[premio53]

I have been playing several games between Arasan 10 and Chess Genius 7.2 in which Arasan 10 has been doing very well, but in this game Arasan makes a critical mistake in the endgame and must settle for a draw.
[Event "1 min/move"]
[Site "?"]
[Date "2007.10.10"]
[Round "?"]
[White "Genius 7.2"]
[Black "Arasan 10"]
[Result "1/2-1/2"]
[ECO "A07"]

1. Nf3 Nf6 2. g3 d5 3. Bg2 c6 4. O-O Bg4 5. d3 Nbd7 6. Nbd2 e5 7. c4 Bd6 8.
cxd5 cxd5 9. h3 Bh5 10. e4 O-O 11. exd5 Nxd5 12. Qb3 N5b6 13. Ne4 Be7 14. a4
Kh8 15. g4 Bg6 16. a5 Bxe4 17. dxe4 Nc5 18. Qc2 Nbd7 19. Rd1 Qe8 20. Bf1 Rc8
21. b4 Na6 22. Qa4 Ndb8 23. Bb5 Nc6 24. Nxe5 Naxb4 25. Bb2 a6 26. Bxc6 Nxc6
27. Nd7 Rg8 28. Nb6 Rd8 29. Bc3 Bd6 30. Rd5 Qe6 31. Rad1 Qh6 32. Qb3 Ne7 33.
R5d3 Qf4 34. e5 Bc5 35. Qb2 Nc6 36. Nd7 Rxd7 37. Rxd7 Qg3+ 38. Kf1 Qxh3+ 39.
Ke1 Re8 40. R1d3 Qxg4 41. Kf1 Qh4 42. Kg1 Kg8 43. Rxb7 Re6 44. Kf1 Qh1+ 45.
Ke2 Qe4+ 46. Re3 Qc4+ 47. Rd3 h5 48. Kd2 Bxf2 49. Rdd7 Qf4+ 50. Kc2 Nxe5 51.
Rd8+ Kh7 52. Kb1 Qe4+ 53. Qc2 Qxc2+ 54. Kxc2 Bg3 55. Rb6 h4 56. Rd5 {Arasan
blunders on the next move ...h3.} h3 57. Rxe6 fxe6 58. Rxe5 Bxe5 59. Bxe5 Kg6
60. Kd3 Kf5 61. Bh2 g5 62. Ke3 Kg4 63. Be5 Kf5 64. Bh2 Kf6 65. Kf3 Kf5 66. Ke3
1/2-1/2
On move 56 Arasan pushes the pawn to h3 blowing an easy win.

[d]8/5ppk/pR2r3/P2Rn3/7p/2B3b1/2K5/8 b - -

[jdart]

I'll take a look at it. Arasan does get the idea that .. h3 is inferior but it is very slow to do so. If I move h3 then search I get:

0 0.00 Bxe5 -2.11 19
0 0.00 Rxe6 -2.11 32
1 0.00 Rxe6 -2.06 67
2 0.00 Rxe6 -2.06 544
3 0.01 Rxe6 -2.06 1683
4 0.01 Rxe6 -2.06 3904
5 0.01 Rxe6 -2.06 8435
6 0.03 Rxe6 -2.31 34202
7 0.08 Rxe6 -2.13 79363
8 0.14 Rxe6 -2.25 145982
9 0.20 Rxe6 -2.00 221608
10 0.47 -- -2.00 565002
11 0.97 Rxe6 -2.44 1213132
12 1.31 Rxe6! -1.94 1594287
12 2.06 Rxe6 -1.88 2432122
13 4.40 Rxe6 -2.31 5095103
14 5.47 Rxe6! -1.81 6280346
14 8.15 Rxe6 -1.75 8999655
15 15.12 Rxe6 -2.00 16622648
16 23.89 Rxe6! -1.50 27219073
16 37.39 Rxe6 -1.31 42012499
17 97.62 Rxe6 -1.19 107681147

--Jon

[premio53]

I thought by not playing the pawn to h3 Black would have a sure win. For some reason Slow Chess could not finish with a win even with a Bishop and 3 pawns vs Rook reaching the following postion after continuing the game with ...56 Nc4. Theoretically the following position should be won by black. Even though h3 was definitely not the best move by Arasan.
[d]8/5ppk/pR2r3/P2Rn3/7p/2B3b1/2K5/8 b - -

[jdart]

Arasan thinks Nc4 is best (analysis at 1 hr/move):

am h3
result: Nc4 3600 seconds. score: +2.75 2371162088 nodes. ++ correct
Nc4 Rxe6 fxe6 Rg5 g6 Kd3 Nd6 Ke3 Kh6 Bf6 Nf5+ Kf3 Bc7 Rg1 h3 Kg4 h2 Bg5+ Kg7 Rh1
Be5 Rb1
result(2): g5 3600 seconds. score: +2.25 2284371716 nodes.
++ correct
g5 Rxe6 fxe6 Rxe5 Bxe5 Bxe5 Kg6 Kd3 Kf5 Bc7 g4 Ke3 e5 Kf2 Kf4 Kf1 Ke4
result(3): Nc6 3600 seconds. score: +2.38 2273801501 nodes.
++ correct
Nc6 Rc5 Ne7 Kd3 Kg6 Bd2 Nf5 Rxe6+ fxe6 Rc6 h3 Rxe6+ Kh5 Rc6 h2 Rc1 g5 Ke4 Kg4 Bc
3

[premio53]

Sorry! I posted the wrong position. The one I intended to show was the one where Slow Chess came down to a Bishop and three pawns against Whites Rook. THAT is thoretically is a won game for Black. Once again, I believe Black should have won by not playing ...h3 on move 56.