Author: Thorsten Czub
Date: 11:16:30 12/26/97
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>Perhaps they are doing heavy pruning on the computers moves? If you >modify the selectivity such that much heavier pruning takes place >on the computers side you might arrarnge extra depth that results in >play that is safe but not opportunistic for the computer. Right. Pruning is ONE explanation. >I remember Richard Langs programs USED to have the characteristic >that they would see anything you could do to them. In some experiments >me and Larry Kaufman did, it would quickly see that you could win >a piece and avoid the loss. But if you forced the piece losing move >and let it think for the winning side, it could not find the win without >a very long think! Very strange. But this was the best program in the >world and pehaps still is. Exactly. But Richard did it with asymmetrie. The plies 1,3,5,7,9,... were very much pruned and genius followed only the best 4 or 5 branches and the moves 2,4,6,8,... were looked brute-force. This gave him some extra plies and more look-ahead than his opponent programs at this time. With the invention of null-move his advantage was melted because the null-move algorithm was as effective as his asymmetrie ! Also his assymmetrrie caused boring style due to the fact that genius played in the plies 1,3,5,7,... often NOT THE BEST move. > >But this makes some sense to me. I don't think a single chess game has >ever been won without an error on the losing side. If your program >NEVER made an error (you wish!) it would never lose (unless of course >the opening position is a loss for one side or the other.) > >I have known people who play like this too. They would be paranoid >about their half of the board and never take even slight risks for >a chance to win. Often these players did quite well although they >played boring chess. I've even seen their opponents walk away in >disgust! But these players often got very good results. It's >up to their opponents to prove there is something wrong with this >style. Right. I am looking forward to study Junior ! Hi Amir ! We will find it out !! :-) > > >-- Don
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