Author: John Lowe
Date: 08:42:18 12/23/02
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On December 23, 2002 at 10:41:03, Vladimir Medvedev wrote: >>Movei can solve it without bonus for passed pawns and without bonus for >>connected passed pawns. > >At which depth? Is it due to good pawn extensions, or due to some other [secret] >technique? > >>Based on your words: >>If your target is to be better in test suites then use 350 >>If your target is to be better in games use 275 > >Yes, this seems to me reasonable. > >>other programmers may use different evaluation for rook,bishop,knight >>and different piece square table and different mobility evaluation. > >In the sources I have read these values are quite typical (100-300-350-500-900, >plus or minus 10...50 centipawns). Hi Vladimir, I should like to learn something along the same lines. If I talk rubbish (often do) perhaps someone more experienced will explain. Your piece values seem very familiar but it strikes me that they are in decimal! My piece values look identical but they're in hexadecimal. The value of a pawn becomes 0100H and bonuses come in units of 0001H Bishops are interesting. 0380H is cumbersome. I have a little scheme: Name: Label: value: Pawn 01 01 =label or 1 Knight 02 03 =label or 1 Bishop 03 03 (+1 if 2 bishops) =label or 1 (+) Rook 04 05 =label or 1 Queen 09 09 =label or 1 King 0F Priceless! (4F sometimes) Even number pieces do not move on diagonals - ever. As you only lose one at a time, two bishops become valued at 7. Bonuses are something else ........ is it usual to talk about "centipawns"? If so I wonder why! I also wonder if everyone has dropped the convention of using bit 15 as the colour flag - it's so efficient to test!
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