Author: Robert Hyatt
Date: 06:37:22 04/11/00
Go up one level in this thread
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...
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.