Author: J. Wesley Cleveland
Date: 15:08:52 05/09/02
Go up one level in this thread
On May 09, 2002 at 13:22:01, Robert Hyatt wrote: >On May 09, 2002 at 12:43:08, Robert Hyatt wrote: > >>On May 08, 2002 at 16:22:16, J. Wesley Cleveland wrote: >> >>>In this position which is an obvious draw for any decent human player, >>>[D]8/8/p2b4/8/p7/3k4/1B6/1K6 w - - 0 4 >>>crafty is clueless - static evaluation is -3.19, evaluation after 34 ply is >>>still -3.19. >> >> >>This is a harder case that my current "knowledge" doesn't cover. Black >>has the right bishop for its rook pawns. Of course white has the same >>colored bishop and if they are traded, it is a draw because of simple >>rook pawns left with the opposing king controlling the queening square. >> >>I can fix this cheaply and will. But it is simply a good illustration of >>just how many special cases there are in endgames that computers have to >>handle... >> >>Be interesting to see if any program currently has this evaluation knowledge >>to call this a draw, statically. It is doable. > > >Old version: > >material evaluation................. -2.00 >development......................... 0.00 >pawn evaluation..................... -0.24 >passed pawn evaluation.............. 0.00 >passed pawn race evaluation......... 0.00 >king safety evaluation.............. 0.00 >interactive piece evaluation........ -0.92 >total evaluation.................... -3.16 > > >new version: > >material evaluation................. -2.00 >development......................... 0.00 >pawn evaluation..................... -0.24 >passed pawn evaluation.............. 0.00 >passed pawn race evaluation......... 0.00 >king safety evaluation.............. 0.00 >interactive piece evaluation........ 2.24 >total evaluation.................... 0.00 > >Fix was straightforward to do without hurting performance... Just had to >"explain" to it that the right bishop is no good if the opponent has one >too... You need to be carefule here - this position is won for black. [D]8/8/p2b1B2/8/8/pk6/8/1K6 w - - 0 1
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