Author: Ed Schröder
Date: 10:15:39 10/26/01
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On October 26, 2001 at 08:21:04, Uri Blass wrote: >[D]8/5P2/4K2k/8/1P2p2p/p7/6R1/5r2 b - - 0 55 bm h3 > >Fritz7 played 56...e3 and lost against Shredder5.32 when 56...h3 is enough for a >draw. > >I believe that Fritz7 lost because it overevaluated passed pawns and evaluated >it's passed pawns as more than the white rook. > >Deep Fritz also needs some minutes to fail low on 56...e3 and I am interested to >know if Deep Fritz is faster or slower than Fritz7 in finding 56...h3 > >Deep Fritz(PIII850,64 mbytes hash with all the 4 piece tablebases and part of >the 5 piece tablebases including KR vs KPP) needs depth 19 and 7 minutes and 20 >seconds to fail low on 56...e3 > >It solves the fail low after 9 minutes and 38 seconds with score of 3.81 for >white and after 16:28 it changes it's mind to Rf4(probably another losing move). > >I may try bigger hash because big hash tables may be important in endgames but I >doubt if it is going to help here. > >There are other programs that need 0 seconds to find 56...h3. > >Uri That's all very weird, I see 2 things you can do to trace the bug: a) turn off null-move b) turn off table bases It must be a bug, e3 is a blunder, h3 is an easy draw. Ed
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