Author: Robert Hyatt
Date: 17:20:35 04/10/00
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On April 10, 2000 at 17:31:57, Pete Galati 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. >> >>to make it resign sooner, try "resign=3" which resigns 5 moves after getting >>to be a piece down. >> > >I assume that that's actually somewhat flexible, I mean if you set Crafty to >resign at 3 (3 pawns?) then Crafty goes down to scores of -3 or less in the >search (must be the final search depth that Crafty reaches before making it's >move) that if at the 4th move, if Crafty has somehow climbed out of the whole >enough to interpret it's score as being -1, then the resign is off. In other >words, 5 consecutive searches at -3 would get Crafty to resign. > >Or, does Crafty score each position currently on the board and resign by that (5 >consecutive positions below resign number) but that method would have to take >away Crafty's ability to be able to see if it would have a way to dig it's way >out of a bad spot. > >Pete This is based on the real game. IE if five consecutive moves are played by crafty, and the score is < -3 for each move (final search value for each move) then it will resign after playing the 5th move.
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