Author: Rafael Andrist
Date: 01:53:28 12/29/01
Go up one level in this thread
On December 28, 2001 at 17:39:06, Ricardo Gibert 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:
>>>
>>>[D]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?
>
>Could you post your progs analysis. 1...Kb2 2.Kc5 Bc3 3.h7 a5 4.Kb5 Kb3 5.h8Q
>Bxh8 6.Kxa5 is 11 ply.
10 ply in total = 7 ply normal + 3 ply quiescence search; nothing special
Wilhelm on a PII-400, 24 MB Hash
ply time value nodes N nodes Q PV
1 0s -3.15 18 2 Kb1-c2
2 0s -3.00 79 2 Kb1-c2 h6-h7
3 0s -3.06 401 72 a6-a5 h6-h7 a5-a4
4 0s -3.09 1196 304 a6-a5 h6-h7 a5-a4 Kd5-c4
5 0s -3.15 3818 600 a6-a5 Kd5-c4 Kb1-c2 h6-h7 a5-a4
6 0s -3.08 11098 2204 a6-a5 Kd5-c4 Kb1-c2 Kc4-b5 Bf6-c3
h6-h7
7 1s 0.00 36299 8058 Bf6-g5 h6-h7 Bg5-f6 Kd5-c5 Kb1-c1
Kc5-b6 Bf6-c3
8 2s 0.00 65410 10302 Bf6-g5 h6-h7 Bg5-f6 Kd5-c5 a6-a5
Kc5-b5 Bf6-c3 h7-h8Q
regards
Rafael B. Andrist
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