Author: Robert Hyatt
Date: 18:36:26 06/23/98
Go up one level in this thread
On June 23, 1998 at 12:47:52, Bruce Moreland wrote: > >On June 23, 1998 at 09:24:16, Robert Hyatt wrote: > >>On June 23, 1998 at 03:19:13, Jouni Uski wrote: >> >>>This is no problem for Fritz4.01 - it displays 0.00 immediately (47 ply). >>> >>>Jouni >> >>if it does, it's wrong, and it's a bug. It takes 100 plies to reach the >>50 move rule, most programs will take 101 plies. Unless, for some reason, >>fritz thinks black is better, as white can force a draw quicker by not >>running all over the board. > >You're really quick to pull the trigger on this. > >If Fritz returns 0.00 on this, it's right. > >If it does it in 47 plies, you can't just immediately declare that it is a bug, >perhaps he is doing something tricky to know the truth, or is using a heuristic >that worked. > >It shouldn't be discounted as a bug, rather, if you are interested, it should be >studied. > >bruce I disagree. If it sees this in the evaluation, then it will recognize this at the root, because *nothing* changes for 100 plies, except the positions of the kings. So it isn't an evaluation thing, IMHO. It *can* be caused by thinking black is winning, because white is the one that makes this take 100 plies to draw, black has far fewer possible squares to roam to, while white has plenty. But if white thinks he is losing, he can dance between two squares and the repetition occurs far before the 50 move rule can kick in...
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