Author: Steffen Jakob
Date: 03:20:00 12/29/01
Go up one level in this thread
Hi Rafael!
On December 29, 2001 at 05:50:19, Rafael Andrist wrote:
>On December 29, 2001 at 04:08:22, Steffen Jakob wrote:
>
>>On December 28, 2001 at 15:27:43, Rafael Andrist wrote:
>>
>>>On December 28, 2001 at 09:10:27, Steffen Jakob wrote:
>>>
>>>>Hi!
>>>>
>>>>Today Hossa played a blitz game with Tinker at ICC where a KBPKP endgame was on
>>>>the board:
>>>>
>>>>8/8/p4b1P/3K4/8/8/8/1k6 b
>>>>
>>>>Hossa evaluates this as a win for black, because the black pawn has a black
>>>>promotion square and there is no white pawn on the b file in front of the black
>>>>pawn. Unfortunately this position is a draw. Can you define a rule for such a
>>>>position class ("search will do it" doesn't count;
>>>
>>>my prog needs 7 ply and a bit less than a second to see the draw. Can you please
>>>post the game + time?
>>
>>I no longer have the time which was spent for each move but only the game score:
>>
>>[Event "ICC 3 1"]
>>[Site "Internet Chess Club"]
>>[Date "2001.12.28"]
>>[Round "-"]
>>[White "Tinker"]
>>[Black "Hossa"]
>>[Result "1/2-1/2"]
>>[ICCResult "Game drawn by repetition"]
>>[WhiteElo "2560"]
>>[BlackElo "2588"]
>>[Opening "French: Tarrasch, open variation"]
>>[ECO "C07"]
>>[NIC "FR.19"]
>>[Time "08:15:24"]
>>[TimeControl "180+1"]
>>
>>1. e4 e6 2. d4 d5 3. Nd2 c5 4. exd5 Qxd5 5. Ngf3 cxd4 6. Bc4 Qd6 7. O-O a6
>>8. Ne4 Qc7 9. Qxd4 Nc6 10. Qc3 e5 11. Bd5 Nf6 12. Nxf6+ gxf6 13. Bd2 Be6 14.
>>Be4 O-O-O 15. Qe3 h5 16. Bc3 Be7 17. a3 Rhg8 18. Bh7 Rh8 19. Bd3 Bf8 20.
>>Rfe1 Bh6 21. Qe4 Ne7 22. Nxe5 fxe5 23. Bxe5 Qc6 24. Bxh8 Qxe4 25. Rxe4 Rxh8
>>26. Rb1 Nc6 27. Rbe1 Rd8 28. Be2 Bg7 29. b3 Rd2 30. c4 Nd4 31. Bd1 Bf8 32.
>>b4 f5 33. R4e3 Bh6 34. Rh3 Bxc4 35. Bxh5 Rb2 36. Bd1 Bg5 37. Rh8+ Kd7 38.
>>Rh7+ Kc6 39. h4 Bf4 40. Rh8 Bc7 41. Bh5 Be6 42. Rh6 Bd6 43. Rc1+ Kb6 44. Re1
>>Kc6 45. Rc1+ Kb6 46. Rg6 Bb8 47. Rd1 Be5 48. Rxd4 Bxd4 49. Rxe6+ Kb5 50.
>>Be8+ Kc4 51. Bf7 Kb5 52. Kh2 Ka4 53. f4 Kxa3 54. Bg6 Bf2 55. h5 Rxb4 56.
>>Bxf5 Rxf4 57. g4 Kb2 58. h6 Bd4 59. Re1 b5 60. Rb1+ Ka2 61. Rh1 b4 62. Kg3
>>Rxf5 63. gxf5 b3 64. f6 Bxf6 65. Kf4 b2 66. Ke4 b1=Q+ 67. Rxb1 Kxb1 68. Kd5
>>a5 69. Kc5 Bc3 70. h7 Ka2 71. Kc4 Kb2 72. Kb5 Bh8 73. Ka4 Ka1 74. Ka3 Bg7
>>75. Kb3 Be5 76. Ka4 Bh8 77. Ka3 Bc3 78. Kb3 Bb2 79. Ka4 Bh8 80. Ka3
>>{Game drawn by repetition}
>>1/2-1/2
>>
>>Greetings,
>>Steffen.
>
>I went back to move Nr. 65 and saw that even there, the position is already a
>draw.
>
>[D]8/8/p4b1P/8/5K2/1p6/k7/7R b - - 0 65
I think so too, but are you sure? I showed the position above because my point
was to emphasize the static evaluation problem. 64. f6?? was a bad move. 64. Kg4
and then Kg5 looks much better/winning. I think Hossa played f6?? because then
the wrong KBPKP evaluation was active in some lines.
Greetings,
Steffen.
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