Author: Tony Werten
Date: 04:46:39 02/04/01
Go up one level in this thread
On February 03, 2001 at 15:24:51, Larry Griffiths wrote: >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 :) alfa-beta :) > >>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. > The nice part of chessprogramming is that you can take one step at a time and see the improvement for quite a long while. I would suggest to get the hashtables correct and then go for nullmove. They are very big winners. Tony >Larry :) > >> >>Tony >> >>> >>>Larry.
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