Author: Jorge Pichard
Date: 14:42:50 02/23/04
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On February 23, 2004 at 15:02:47, Uri Blass wrote: >On February 23, 2004 at 13:33:12, John Merlino wrote: > >>Michael Byrne posted some analysis by Shredder 8 yesterday that ended with these >>two PVs: That is strange, I just run two infinite Analysis on my Athlon 1.2 GHz for 09:40 and it gave me two different results: [d]2r2rk1/p3bb1p/2n1Q1p1/q2pP3/3P1P2/p1NB1NR1/1P4P1/1K1R4 w - - 0 24 New game 2r2rk1/p3bb1p/2n1Q1p1/q2pP3/3P1P2/p1NB1NR1/1P4P1/1K1R4 w - - 0 1 Analysis by Shredder 8: 1. +- (5.58): 1.Bxg6 Bxe6 2.Bxh7+ Kh8 3.Rh1 Bh4 4.Bd3 Rxf4 5.Nxh4 Rf1+ 6.Rxf1 Nxe5 7.dxe5 a2+ 8.Nxa2 Bf5 2. -+ (-6.94): 1.Rxg6+ hxg6 2.Qg4 Qb6 3.Rd2 Nxd4 4.Nxd4 Rxc3 5.Nf5 Rb8 6.Nh6+ Kf8 7.Qxg6 Bxg6 8.Nf5 +- (5.61) Depth: 15/47 00:09:40 140720kN (Pichard, MyTown 23.02.2004) New game 2r2rk1/p3bb1p/2n1Q1p1/q2pP3/3P1P2/p1NB1NR1/1P4P1/1K1R4 w - - 0 1 Analysis by Shredder 8: 1. +- (6.23): 1.Bxg6 Bxe6 2.Bxh7+ Kh8 3.Rh1 a2+ 4.Ka1 Rxf4 5.Bd3+ Bh4 6.Nxh4 Rf1+ 7.Rxf1 Bf5 8.Rxf5 Nxe5 9.dxe5 2. -+ (-6.93): 1.Rxg6+ hxg6 2.Qg4 Qb6 3.Rd2 Nxd4 4.Nxd4 Rxc3 5.Nf5 Rc1+ 6.Kxc1 a2 7.Nxe7+ Kg7 8.Kd1 a1Q+ 9.Ke2 +- (5.61) Depth: 15/47 00:09:40 140720kN (Pichard, MyTown 23.02.2004) >>24.Bxg6 Bxe6 25.Bxh7+ Kh8 26.Rh1 Bh4 27.Bd3 Rxf4 28.Nxh4 Nxd4 29.Nf3+ Bh3 >>30.Rhxh3+ Rh4 31.Rxh4# >> +- (5.11) Depth: 15/45 00:03:50 85550kN >>24.Bxg6 Bxe6 25.Bxh7+ Kh8 26.Rh1 Bh4 27.Bd3 Rxf4 28.Nxh4 Rxd4 29.Nf5+ Rh4 >>30.Rxh4# >> +- (5.61) Depth: 15/46 00:04:40 100640kN >> >>Obviously, those '#' symbols are incongruous with the eval. Has this been >>mentioned before? >> >>The post is at www.talkchess.com/forums/1/message.html?350488. >> >>jm > > >I saw this king of behaviour with some programs. >Shredder is not the first program when it happened to it and I saw it with >Junior and Crafty in the past. > >I guess that it is no bug and there are 2 possibilities: > >1)Shredder does not detect mate in the evaluation >2)The pv is some not reliable moves that shredder collected from the hash tables >instead of having pv array. > >Uri
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