Thread View: gnu.chess
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2 total messages
Started by Paul Vaughan
Fri, 05 Jul 1991 22:20
strange move
Author: Paul Vaughan
Date: Fri, 05 Jul 1991 22:20
Date: Fri, 05 Jul 1991 22:20
30 lines
1639 bytes
1639 bytes
I was playing gnuchessr on a SUN4 today and had it make a pretty strange move. I had just taken a pawn at d6, exchanging rookes and sacrificing the extra bishop to get a simple, easily won endgame, shown by this position. xboard position file -- Fri Jul 5 17:09:19 1991 black to move (gnuchessr) . . . . . . . . . . . k . . . . . . . B . . . . . . . . p . . . . . K . P p . . . . . . . P . . . . . . . . . . . . . . . . . . gnuchessr plays d7e6 instead of d7d6 (KxB) after thinking for about a minute. What's the deal? Is its endgame analysis strong enough that it realized that all continuations lose? Or does this reveal some problem in the algorithm? I've been seeing it do a lot of strange things lately. Like give up a mate in one when it could have postponed it for at least two. Most commercial programs won't do that--they usually rate a loss in 3 as a little better than a loss in 1. Paul Vaughan, MCC CAD Program | ARPA: vaughan@mcc.com | Phone: [512] 338-3639 Box 200195, Austin, TX 78720 | UUCP: ...!cs.utexas.edu!milano!cadillac!vaughan ----------------------------------------------------------------------------------
Re: strange move
Author: William Thomas Angel
Date: Tue, 09 Jul 1991 12:24
Date: Tue, 09 Jul 1991 12:24
11 lines
1004 bytes
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>gnuchessr plays d7e6 instead of d7d6 (KxB) after thinking for about a minute. What's the deal? If the search depth parameter "depth" is set manually to 10, and the program terminates the search when it is completed at this depth, rather than on the basis of a timeout signal, the better move (d7d6) is selected. I'm running gnuchess on an IBM PC, and so wasn't able to check the program search for a depth selection greater than 10, due to the slow speed of the machine.
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