Author: Robert Hyatt
Date: 07:56:45 04/27/03
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On April 26, 2003 at 19:15:04, Drexel,Michael wrote: >Today I started an interesting experiment. >A match Chessmaster 9000 against Shredder 7.04 in Chessbase GUI with >over-optimistically settings for The King 3.23. >With this settings The King engine evaluates his positions almost always as >better for himself, except it is completely lost. You are overlooking a key point. The alpha/beta algorithm is relative to the initial score. If a program starts off at +3.0, and another program starts off at 0.0 in the same position, the two programs can play identically. All alpha/beta tries to do is maximize the raw score at the root, whether it is +3 or -3 is irrelevant... > >Surprisingly a 30 game match ended: >Chessmaster 9000 - Shredder 7.04: 15.5-14.5 (+12 =7 -11) >5 min, AMD 2200+, ponder off, Remis.ctg, alternate colours > >I told The King that the own qeen is better than the opponents qeen, the own >rooks are better than the opponent rooks, the own bishops are better than the >opponent bishops and so on... > >Its over-optimistically evaluations dont hurt at all. > >The evaluations were way off but it nevertheless won the match and played a lot >of exciting games although it lacks resistance in worse positions. >Chessmaster played very strong in positions it had an advantage. > >Therefore I think it should be a good idea to have completely different >evaluations. >For clearly better positions an optimistically evaluation (Shredder obviously >has very high scores in such positions) and for worse positions a more realistic >evaluation. > >Michael
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