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Subject: Re: Position from Sjeng - Chezzz

Author: Dann Corbit

Date: 10:46:13 01/21/02

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On January 21, 2002 at 13:41:25, Dann Corbit wrote:

>On January 21, 2002 at 11:00:13, David Rasmussen wrote:
>
>>[D]8/1R5P/8/p7/2k1pK2/2p5/8/7r b - - 0 60
>>
>>Chezzz eventually moved Rh4+, which lead to a draw. It considered c2, but
>>rejected it. What is the best move here, and can black win? The game history
>>might be important too, I don't know. Here's the game:
>>
>>[Event "ICC 60 10 u"]
>>[Site "Internet Chess Club"]
>>[Date "2002.01.20"]
>>[Round "-"]
>>[White "Sjeng"]
>>[Black "Chezzz"]
>>[Result "1/2-1/2"]
>>[ICCResult "Game drawn by mutual agreement"]
>>[WhiteElo "2492"]
>>[BlackElo "2362"]
>>[Opening "Queen's pawn: English defense"]
>>[ECO "A40"]
>>[NIC "QO.17"]
>>[Time "13:23:40"]
>>[TimeControl "3600+10"]
>>
>>1. d4 b6 2. e4 Bb7 3. f3 e6 4. Nc3 Bb4 5. Ne2 d5 6. a3 Be7 7. Nf4 dxe4 8.
>>fxe4 Nf6 9. Bb5+ c6 10. Be2 O-O 11. O-O a5 12. e5 Nd5 13. Ncxd5 exd5 14. Nh5
>>Bc8 15. Qe1 Bh4 16. Nf6+ Qxf6 17. exf6 Bxe1 18. fxg7 Kxg7 19. Rxe1 Bf5 20.
>>c4 dxc4 21. Bxc4 Nd7 22. Bd2 Rae8 23. d5 cxd5 24. Bxd5 Nf6 25. Bc3 Kg6 26.
>>Bb3 Ne4 27. Bd4 Nc5 28. Bxc5 bxc5 29. Ba4 Rxe1+ 30. Rxe1 Rb8 31. Re2 Kf6 32.
>>Kf2 Bd3 33. Rd2 Be4 34. Ke3 Ke5 35. Bd1 f5 36. g3 c4 37. Re2 Rd8 38. Bc2 Rb8
>>39. Ba4 h5 40. Kf2 h4 41. gxh4 Rh8 42. Bc2 Rxh4 43. Bxe4 fxe4 44. Kg3 Rh8
>>45. h4 Kd4 46. Rd2+ Ke3 47. Rd7 Rg8+ 48. Kh3 Rb8 49. h5 Rxb2 50. h6 Rb6 51.
>>h7 Rh6+ 52. Kg4 c3 53. Kg5 Rh1 54. Rc7 Kd2 55. Rd7+ Kc1 56. Rf7 Kb2 57. Rb7+
>>Kxa3 58. Rc7 Kb3 59. Rb7+ Kc4 60. Kf4 Rh4+ 61. Kg3 Rh6 62. Kf4 Kd5 63. Rc7
>>Rh5 64. Kg4 Rh1 65. Rxc3 Rxh7 66. Ra3 Ra7 67. Ra4 Ke5 68. Kg3 Kf5 69. Kf2
>>Kf4 70. Ke2 Ra6 71. Kf2 Ra7 72. Ke2 Ra6 73. Kf2 Ra8 74. Ke2 Ra7 75. Kf2 Ra8
>>76. Ke2 Ra7 77. Kf2 Ra6 78. Ke2 Rh6 79. Rxa5 Rh2+ 80. Kd1
>>{Game drawn by mutual agreement}
>>1/2-1/2
>>
>>What knowledge does a program need to pick the/a winning move from this position
>>fairly quickly (besides from TB's)?
>
>Takes Pepito quite a while to find a4 (almost 3 minutes).
>
>Pepito> setboard 8/1R5P/8/p7/2k1pK2/2p5/8/7r b - -
>Pepito> go
> 5   362    91     9890  c2 Rb7-c7 Kc4-d3 Rc7-d7 Kd3-e2 Rd7-c7 Ke2-d2
> 5   362    92    11794  c2 Rb7-c7 Kc4-d3 Rc7-d7 Kd3-e2 Rd7-c7 Ke2-d2
> 6   329    99    41454  c2 ?? Rb7-c7 Kc4-d3 Rc7-d7 Kd3-e2 Rd7-c7 Ke2-d2
> 6   330   102    49557  c2 !!
> 6   327   102    51900  c2 Rb7-c7 Kc4-d3 Rc7-d7 Kd3-c3 Rd7-c7 Kc3-d2 Rc7-d7
>Kd2-e2 Rd7-c7
> 6   327   104    58531  c2 Rb7-c7 Kc4-d3 Rc7-d7 Kd3-c3 Rd7-c7 Kc3-d2 Rc7-d7
>Kd2-e2 Rd7-c7
> 7   360   111    87456  c2 !!
> 7   333   112    91502  c2 Rb7-c7 Kc4-d3 Rc7-d7 Kd3-c3 Rd7-c7 Kc3-d2 Rc7-d7
> 7   333   119   120933  c2 Rb7-c7 Kc4-d3 Rc7-d7 Kd3-c3 Rd7-c7 Kc3-d2 Rc7-d7
> 8   300   175   366319  c2 ?? Rb7-c7 Kc4-d3 Rc7-d7 Kd3-c3 Rd7-c7 Kc3-d2 Rc7-d7
> 8   284   221   562189  Kc4-d5 Rb7-c7 a4 Kf4-f5 a3 Rc7xc3 a2 Rc3-a3 a1=B
> 8   284   238   634808  Kc4-d5 Rb7-c7 a4 Kf4-f5 a3 Rc7xc3 a2 Rc3-a3 a1=B
> 9   293   285   844319  Kc4-d5 Rb7-c7 a4 Kf4-f5 a3 Rc7xc3 a2 Rc3-a3 Rh1-f1
>Kf5-g6 Rf1-g1 Kg6-f6 a1=B
> 9   293   334  1068215  Kc4-d5 Rb7-c7 a4 Kf4-f5 a3 Rc7xc3 a2 Rc3-a3 Rh1-f1
>Kf5-g6 Rf1-g1 Kg6-f6 a1=B
>10   289   433  1522123  Kc4-d5 Rb7-c7 a4 Kf4-f5 Kd5-d4 Kf5-f6 e3 Rc7-d7 Kd4-e4
>Rd7-e7 Ke4-d3 Kf6-g7
>10   289   547  2050061  Kc4-d5 Rb7-c7 a4 Kf4-f5 Kd5-d4 Kf5-f6 e3 Rc7-d7 Kd4-e4
>Rd7-e7 Ke4-d3 Kf6-g7
>11   265   653  2543858  Kc4-d5 Rb7-c7 a4 Kf4-f5 Kd5-d4 Kf5-g6 e3 Rc7-d7 Kd4-e4
>Rd7-e7 Ke4-d3 Re7-d7 Kd3-e2 Kg6-g7
>11   265   854  3451594  Kc4-d5 Rb7-c7 a4 Kf4-f5 Kd5-d4 Kf5-g6 e3 Rc7-d7 Kd4-e4
>Rd7-e7 Ke4-d3 Re7-d7 Kd3-e2 Kg6-g7
>12   291  1221  4979960  Kc4-d5 Rb7-c7 a4 Kf4-f5 Kd5-d4 Kf5-g6 e3 Rc7-d7 Kd4-e4
>Rd7-d1 Rh1-h4 Kg6-g7 Rh4-g4 Kg7-h8
>12   291  1472  6158720  Kc4-d5 Rb7-c7 a4 Kf4-f5 Kd5-d4 Kf5-g6 e3 Rc7-d7 Kd4-e4
>Rd7-d1 Rh1-h4 Kg6-g7 Rh4-g4 Kg7-h8
>13   271  1963  8319152  Kc4-d5 Rb7-c7 a4 Kf4-f5 Kd5-d4 Kf5-g6 e3 Rc7-d7 Kd4-c4
>Rd7-d1 Rh1-h4 Rd1-a1 Kc4-b3 Kg6-g7
>13   271  2931 12869142  Kc4-d5 Rb7-c7 a4 Kf4-f5 Kd5-d4 Kf5-g6 e3 Rc7-d7 Kd4-c4
>Rd7-d1 Rh1-h4 Rd1-a1 Kc4-b3 Kg6-g7
>14   257  4713 20943418  Kc4-d5 Rb7-c7 a4 Kf4-f5 Kd5-d4 Kf5-g6 e3 Rc7-d7 Kd4-e4
>Rd7-d1 Rh1xd1 h8=Q c2 Qh8-e8 Ke4-d3 Qe8-b5 Kd3-c3 Qb5-a5 Kc3
>-b2
>14   257  9437 42121527  Kc4-d5 Rb7-c7 a4 Kf4-f5 Kd5-d4 Kf5-g6 e3 Rc7-d7 Kd4-e4
>Rd7-d1 Rh1xd1 h8=Q c2 Qh8-e8 Ke4-d3 Qe8-b5 Kd3-c3 Qb5-a5 Kc3
>-b2
>15   237 12704 56324491  Kc4-d5 Rb7-c7 a4 Rc7xc3 Rh1xh7 Rc3-a3 Rh7-f7 Kf4-g5
>Rf7-g7 Kg5-f4 Rg7-a7 Ra3-a1 Ra7-f7 Kf4-g4 e3 Ra1xa4 e2 Ra4-a5 K
>d5-e4 Ra5-a1
>15   290 17508 77808102  a4 !!

To beat you to the punch, I did this analysis without tablebase files!

I will do a follow-up with tablebase files enabled (I assumed that the current
Chezzz does not have tablebase files).



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