Author: Ernst Walet
Date: 08:46:35 02/09/00
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On February 08, 2000 at 10:19:06, Stefan Meyer-Kahlen wrote: >On February 07, 2000 at 16:10:55, Ernst Walet wrote: > >>I´ve seen some strange evaluation glitch in Shredder 4 with the following >>position. >> >>8/1K6/8/5k2/bR1P1r2/1n6/8/8 w - - >> >>Shredder wants to play Rxa4, score ply 9-14 about -1.2 >> >>Make the move. >> >>Shredder wants to play Nxd4, score ply 9-14 about +4.71 >> >>Make the move. >> >>Shredder wants to play Ra8, score ply 9-14 about -1.3 >> >> >>Why such a different score after the first move? Does Shredder much >>preprocessing? >> >>Ernst-J. > > >Thanks for your interesting post! > You´re welcome. >First of all, Shredder's evaluation is always from the point of view >of the moving side, so there is "only" a difference of 3.5 pawns and not >5 pawns :-) > I know, nevertheless.... >This is a special case for which I added code after Jakarta 96, where Shredder >almost blew a game against Virtual Chess. > >I, like many other programmers, evaluate a KRN-KR ending very drawish. In your You´re right, this game ended as draw. >second example, I simple deactived that code so Shredder as black this time will >go for the last white pawn. If the code were still active, Shredder would never >capture the pawn, because KRN-KRP would be better than KRN-KR. I agree that >there are other ways to solve that issue, but I haven't touched that code for >quite a while now and almost forgot that this is still in there. > >I agree that this is very brute force, but that method proved to be very >succesful in chess :-) > >Hope this helps > Stefan Thanks for your reply, Stephan. Ernst-J.
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