Author: Uri Blass
Date: 11:12:44 12/30/04
Go up one level in this thread
On December 30, 2004 at 12:18:26, Norm Pollock wrote: >Fruit 2.0 is indeed much improved. I used Fruit 2.0 a few times on playchess.com >and I noticed that it weakened late. Perhaps if Fabien were to insert Nalimov >tbs, that would not happen. Maybe the problem is some wrong knowledge about simple endgames Fruit evaluates the following position as a draw and it seems that there is a bug in the function that detects draw in KBP vs KB. Fruit could probably do better in case of using the nalimov tablebases for debugging of it's evaluation. Note that I do not have functions to detect draws in KBP vs KB and one of the reasons is simply the fact that I did not get permission from nalimov to use his tablebases. Having functions to detect draws in tablebases position is one of the things that I may work about after I get permission from nalimov to use tablebases. Before getting permission from nalimov there is no point in working about evaluation for these cases because the evaluation will probably have bugs like fruit. New game, [D]8/7P/8/8/K7/p1b5/1k6/1B6 w - - 0 1 Analysis by Fruit 2.0: 2.Ba2 Kxa2 -+ (-2.01) Depth: 1/2 00:00:00 2.Bc2 Kxc2 3.Kxa3 = (0.00) Depth: 1/3 00:00:00 2.Bd3 ² (0.40) Depth: 1/3 00:00:00 2.Be4 ² (0.47) Depth: 1/3 00:00:00 2.Be4 a2 = (0.00) Depth: 2/3 00:00:00 2.Be4 a2 3.Bd5 a1Q+ 4.Kb5 -+ (-6.96) Depth: 3/6 00:00:00 2.h8Q Bxh8 3.Kb4 = (0.00) Depth: 3/8 00:00:00 2.h8Q Bxh8 3.Bc2 Kxc2 4.Kxa3 = (0.00) Depth: 4/8 00:00:00 2.h8Q Bxh8 3.Kb4 a2 4.Bxa2 = (0.00) Depth: 5/12 00:00:00 2.h8Q Bxh8 3.Kb4 a2 4.Bxa2 Kxa2 = (0.00) Depth: 6/14 00:00:00 2kN 2.h8Q Bxh8 3.Kb4 a2 4.Bxa2 Kxa2 = (0.00) Depth: 7/15 00:00:00 4kN 2.h8Q Bxh8 3.Kb4 a2 4.Bxa2 Kxa2 = (0.00) Depth: 8/18 00:00:01 6kN 2.h8Q Bxh8 3.Kb4 Be5 4.Ka4 Bd6 5.Ba2 Kxa2 6.Kb5 -+ (-5.04) Depth: 9/18 00:00:01 13kN 2.h8Q Bxh8 3.Kb4 Be5 4.Ka4 Bd6 5.Be4 a2 6.Kb5 a1Q -+ (-9.74) Depth: 10/18 00:00:01 24kN 2.h8Q Bxh8 3.Kb4 Be5 4.Ka4 Bd6 5.Be4 a2 6.Kb5 a1Q 7.Kb6 Qg1+ 8.Kb5 -+ (-9.92) Depth: 11/25 00:00:01 149kN 2.h8Q Bxh8 3.Kb4 Be5 4.Ka4 Bd6 5.Bd3 a2 6.Kb5 a1Q 7.Kc6 Qa4+ 8.Kxd6 Qd4+ 9.Ke6 Qxd3 -+ (-9.97) Depth: 12/32 00:00:01 395kN 2.h8Q Bxh8 3.Kb4 Be5 4.Ka4 Bd6 5.Be4 a2 6.Kb5 a1Q 7.Kc6 Qa6+ 8.Kd5 Kc3 -+ (-10.11) Depth: 13/33 00:00:01 876kN 2.h8Q Bxh8 3.Kb4 Be5 4.Ka4 Bd6 5.Be4 a2 6.Kb5 a1Q 7.Kc6 Qa6+ 8.Kd5 Kc3 9.Bf5 Qa5+ 10.Kxd6 Qxf5 -+ (-10.17) Depth: 14/36 00:00:02 1803kN 2.h8Q Bxh8 3.Kb4 Bf6 4.Ka4 Be7 5.Be4 a2 6.Kb5 a1Q 7.Kc4 Qa4+ 8.Kd5 Kc3 9.Ke5 Qd4+ 10.Kf5 -+ (-10.24) Depth: 15/37 00:00:02 3612kN 2.h8Q Bxh8 3.Kb4 Bf6 4.Ka4 Be7 5.Be4 a2 6.Kb5 a1Q 7.Kc4 Qc1+ 8.Kd5 Qg5+ 9.Kc6 Qf6+ 10.Kb7 Qd4 11.Bc6 -+ (-10.53) Depth: 16/41 00:00:06 9241kN 2.h8Q Bxh8 3.Kb4 Bf6 4.Ka4 Be7 5.Be4 a2 6.Kb5 a1Q 7.Kb6 Qa3 8.Bg2 Qb4+ 9.Kc7 Qf4+ 10.Kd7 Qd6+ 11.Ke8 Bg5 -+ (-10.63) Depth: 17/44 00:00:19 27890kN (, MyTown 30.12.2004)
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