Author: Uri Blass
Date: 02:47:59 12/31/02
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On December 31, 2002 at 05:32:58, Dana Turnmire wrote: >I played a few Fischer Random games between CM9000 and Genius 7 and decided to >test the "learning" feature of Genius 7. All fives games were started from the >same position. Notice in the first game how Genius is crushed (mate was >announced in 16 by CM9000 around move 29). > >In game two at move 22 Genius as black decides on 22...fxe5 instead of 22...Qe8 >but is still crushed a few moves later. > >In game 3 Genius 7 tries 22...Ng5 although Chessmaster sees a pawn plus >advantage several moves prior to move 22. > >In game 4 Genius 7 decides to wait until move 23 and to change from 23...Ke8 to >23...Qe8 and once again gets crushed a few moves later. > >In game 5 Genius 7 waits until move 24 to change 24...Qf8 to 24...b5. Again >same result a few moves later with a crushing defeat for Genius 7. > >It seems the crude attempt of Genius 7 to "learn" from its mistakes are >laughable since its position has already been lost according to CM9000. It >could continue to make minor move variations and would probably lose the next 20 >games in a row doing this. The fischer random starting position basically >forces both programs to play without an opening book and shows one reason why a >good opening book is vital to a program. > >I understand Genius has a learning feature that is not tied to the opening book >but attempts to vary it's moves when it starts having a losing score. Wouldn't >it be much more effective to tie the learning feature in so that when a loss >occurs the program refuses to play the exact variation of that particular >opening in which the loss took place? > >I know that playing with opening books, games aren't duplicated like they would >be with fischer random chess but in a long match that might be found at SSDF it >seems CM9000 would be at a tremendous disadvantage if there was no mechanism to >stop playing losing lines against other programs. The flip side of this little >experiment is if a position was started and Genius won the game then Chessmaster >would be on the losing side every single game. I think that there is a problem with the evaluation of Genius. Movei shows a clear negative score of more than one pawn from the first iteration thanks to mobility evaluation. [D]r1nk2qr/3p1bpn/1ppPpp1p/P3P2P/1B1P4/3N1QP1/5P2/RB1KR3 b - - 0 22 I wonder if Genius7 evaluates mobility. Uri
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