Author: Jeremiah Penery
Date: 14:10:38 04/11/00
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On April 11, 2000 at 09:37:22, Robert Hyatt wrote: >On April 11, 2000 at 03:33:46, Jeremiah Penery wrote: > >>On April 10, 2000 at 15:54:49, Robert Hyatt wrote: >> >>>On April 10, 2000 at 11:01:43, Colin Frayn wrote: >>> >>>>I was just wondering how Crafty handles draws in its evaluation routine. I've >>>>been playing several 10 minute blitz games (10 min/side) between Crafty and >>>>ColChess and I managed to win the following two games, though I noticed that >>>>near the end Crafty was often giving the position as drawn to many ply (like 20 >>>>or more) as it thought it could draw by repetition when behind. ColChess plays >>>>along a few times, then realises what's about to happen and plays something >>>>else, whereby Crafty's analysis goes very negative again. >>>> >>>>Surely Crafty must know that ColChess will try to avoid a draw when ahead? >>>> >>>>Also, does Crafty have a contempt setting? I would have resigned both of these >>>>games a lot earlier :) >>>> >>>>Cheers, >>>>Col >>> >>>The only thing that will cause the above is drastic differences in the >>>evaluation. Crafty thinks that the opponent will either repeat or get a worse >>>position... so it assumes it will repeat. >> >>I think he means after his program has repeated the position twice already. In >>this case, Crafty will think it's a draw anyway, then it could play an inferior >>repeating move instead of trying to improve the position. > > >No.. the latest version(s) don't do this. I too John's idea of not counting >2-fold repeats as draws in the first 2 plies of searching, so that it won't >do what you suggest. If the current version (.10 or .11) says draw, it is >_really_ a draw if the draw occurs within 2 plies... Of course, that's assuming he's using the very latest version. :)
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