Author: Robert Hyatt
Date: 10:00:11 09/27/04
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On September 26, 2004 at 19:22:24, Jan K. wrote: >Hi, please does someone have a database of 'symmetric' positions(divided into >opening,middlegame,endgame,king safety,pawns only,.....) that could be used to >test if eval gives the same bonuses for both white and black? Thanks. Do what I do in Crafty... I have a command to flip the board, which simply takes the chess board and rotates it around the line between the 4th and 5th rank, and then changes each white piece to black and vice versa. I also have a "flop" command that mirrors the board by flipping it around the line between the d and e files, but it doesn't change the color of each piece. With an original board, plus a flop, flip and another flop, you can catch king-queenside inconsistencies as well as white-black inconsistencies...
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