Author: Uri Blass
Date: 22:43:45 10/25/03
Go up one level in this thread
On October 26, 2003 at 01:03:53, scott farrell wrote: >On October 24, 2003 at 20:35:33, José Carlos wrote: > >> From a test game of my engine Anubis: >> >>[D]r1b5/pp1p3k/1b1p4/5R2/4PB2/2N4r/PP3n1P/1K4R1 b - - 7 30 >> >> It seems that only Nd3 draw, according to Ruffian. My program lost this game >>(with black). It seems very hard for it to find the drawing move (it wants to >>play Kh8 for a long time), although I believe most programs will find it easier. >> What do your engines say? Do other moves also draw? >> >> José C. >It mostly depends on how you score a draw. > >Crafty eventually says Nd3 also with a draw score. > >My engine chompster sees white attempting a draw due to contempt factor, and >+0.5 for white as a draw, with black playing Bd4 - and black cant stop a forced >draw by white - which with contempt factor says its a win to white that black >cant stop. This is good if the player on white has less rating, which is the >idea of the contempt fator, they will probably just go for the draw (as I would >against a comp). > >This probably means a few moves before this my engine may have avoided this >position given it was heading towards a draw. > >your positional scores for the bad bishop and bad rook vs more material for >black will have a huge effect on whether it keeps or discards branches with >draws in them. > >playing with my contempt factor, it sees ND3, or Bd4 - it really depends who its >thinks is ahead, and which player might be trying for a draw, given wither side >can force a draw (and for a bit Nxe4 as a draw, but then sees white wins on the >next ply). > >Scott Movei see Nxe4 with a draw score at small depth and only at depth 13 it fails low and changes its mind to Nd3 depth=13 -0.52 f2d3 Nodes: 38514650 NPS: 194833 Time: 00:03:17.68 depth=14 +0.00 f2d3 f5f7 h7h8 f7f8 h8h7 f8f7 Nodes: 50914975 NPS: 193924 Time: 00:04:22.55 depth=15 +0.00 f2d3 f5f7 h7h8 f7f8 h8h7 f8f7 Nodes: 64021743 NPS: 196989 Time: 00:05:25.00 After Nxe4 It says depth=12 +0.01 g1g2 Nodes: 14464477 NPS: 204966 depth=12 +0.30 g1g2 Nodes: 19145211 NPS: 195618 Time: 00:01:37.87 depth=12 +0.61 g1g2 e4c3 b2c3 b6a5 f5a5 b7b6 a5g5 c8b7 g2e2 h7h8 f4d6 a8g8 g5g8 h8g8 b1c2 Nodes: 34670678 NPS: 186813 Time: 00:03:05.59 After Kh8 it is more easy for it to find a clear positive score for white and after some time it finds a clearly winning score. depth=11 +0.62 c3d5 f2e4 f5f8 h8h7 f8f7 h7h8 d5b6 a7b6 f7f8 h8h7 f8g8 h3g3 g8g3 e4g3 g1g3 d6d5 Nodes: 3643839 NPS: 206684 Time: 00:00:17.63 depth=11 +0.62 c3d5 f2e4 f5f8 h8h7 f8f7 h7h8 d5b6 a7b6 f7f8 h8h7 f8g8 h3g3 g8g3 e4g3 g1g3 d6d5 Nodes: 9805659 NPS: 205698 Time: 00:00:47.67 depth=12 +4.74 c3d5 f2e4 g1g4 b6d8 f5f8 h8h7 f8g8 e4g5 g8d8 h3f3 f4g5 f3f1 g5c1 b7b5 h2h4 Nodes: 71760374 NPS: 185345 Time: 00:06:27.17 After Bd4 again it is eady to see a big positive score for white depth=9 +0.56 c3b5 d4b2 b1b2 f2d3 b2a1 d3f4 f5f4 d6d5 f4f7 h7h8 f7f8 h8h7 e4d5 h3h2 f8f7 h7h8 Nodes: 1329410 NPS: 199911 Time: 00:00:06.65 depth=11 +1.46 c3b5 Nodes: 8632764 NPS: 185571 Time: 00:00:46.52 depth=11 +1.59 c3b5 d4b2 b1b2 f2d3 b2b1 d3f4 f5f7 h7h8 f7f4 d6d5 f4f8 h8h7 g1g8 h3h6 f8c8 a8c8 g8c8 d5e4 Nodes: 10837503 NPS: 186499 Time: 00:00:58.11 depth=12 +2.10 c3b5 b7b6 b5d4 c8b7 f5f7 h7h8 f4d6 b7e4 b1a1 f2d3 d6e7 h3h6 e7f6 h6f6 f7f6 d7d5 f6h6 e4h7 Nodes: 25054356 NPS: 184304 Time: 00:02:15.94 Uri
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