Author: Vine Smith
Date: 00:04:34 05/27/01
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On May 26, 2001 at 22:16:12, K. Burcham wrote: > > >a game posted here that deep shredder on dual 800's, lost to insomniac, >i cannot get my shredder5 (no patch), 1460 mhz 300 megs hash, 768 megs ram, >to make the same moves. > >for example move 11. the deep shredder played hxg4. > >my shredder5 wants to exchange bishops and attack the queen. >this move would be Bxg4. > >i thought maybe it would change to hxg4, but it never did. >the 1460 is probably searching about the same kns as the dual 800's. >during move 11, shredder5 was searching about 290 kns. > >after 10 minutes analysing move 11, shredder5 says the move deep shredder chose >is .5 worse than its choice. > >in other words deep shredder hxg4 -.5 > shredder5 Bxg4 .0 > > >and there are several other examples in this same game. > >how do we explain this? > >if deep shredder has the same search as shredder5, and if both programs search >the same number of nodes for move 11, then how do we explain this? > >thanks 11...hxg4 is a known book move, so even if it's not in the Shredder 5 book, that could just mean a different or adjusted book was used for the tournament. This might be the result of "learning" (I don't know if Shredder implements this feature, but it seems likely, where a program avoids book lines it has had bad experience with) or just a precaution against someone finding holes in the commercial version's book and using this knowledge against the program. Regards, Vine Smith
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