Author: Ferdinand S. Mosca
Date: 18:59:56 04/26/03
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On April 26, 2003 at 19:15:04, Drexel,Michael wrote: Hello Mike, >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. That's a good test. >With this settings The King engine evaluates his positions almost always as >better for himself, except it is completely lost. What is the average/largest score of Shredder (winning) that the king is actually losing? and what is the score of the king? >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... What is the actual margin of piece values? Running another test with same number of games, same opening positions but this time make no margin in piece values for the King would give us further views between optimistic and realistic evaluations. > >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. I think Crafty by Hyatt will penalize further if the position is bad. If the position is bad there should be resistance, however it is very very hard to come back from an attack to the king, I mean if king safety is involved, this at least for many engines. Regards, Ferd > >Michael
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