Author: Larry Griffiths
Date: 12:24:51 02/03/01
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On February 03, 2001 at 13:14:12, Tony Werten wrote: >On February 03, 2001 at 12:00:55, Larry Griffiths wrote: > >>On February 02, 2001 at 19:35:47, Tony Werten wrote: >> >>> >>>Quite normal when you evaluate with material only or eval=0 >>> >>>>They tend to be much >>>>higher on even plys. >>> >>>Comes with (plain) alfa-beta. You try to get around it with nullmove, extensions >>>and an elaborated evaluation function. >>> >>>Some work left for you, >>> >>>Tony >>> >>Thanks Tony, >> >>I have not been able to get null move to work, but I will keep on trying. > >I've found that the easiest way is to actually have a make_nullmove function >where you store the move, chance color_to_play, get rid off the enpassant >square, store hashkey etc. just as you would normally do with a make_move. It probabably would be better to say that I do not understand NullMove. I will get out Ernst's book and look at it again. I also might search the web to look for articles on NullMove. I sort of do hashing, but that is another thing I am not too whippy at. > >>I have done some extensions before, but dropped them when I converted from >>alpha/beta to negamax. > >Don't you mean from negamax to alfa-beta ? Its negamax WITH cutoffs, whatever it is called :) >Easy extensions are "in check" and "passed pawn to 7th rank" > >>I have no idea what elaborated evaluation means. > >A "big" evaluation function. OK, Thanks Tony. If I can understand some of this stuff within the next 10 years, then I might be able to reach my lifetime goal of a program rated over 2000. It seems as I am getting older, that the elevator does not go to the top floor anymore. Larry :) > >Tony > >> >>Larry.
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