Author: Dann Corbit
Date: 17:30:42 07/12/00
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On July 12, 2000 at 20:01:15, Jeremiah Penery wrote: >On July 12, 2000 at 19:39:37, walter irvin wrote: > >>i was testing several programs in paulsen vs morphy where morphy made the great >>sac 17. QxB .i tested several programs ,hiarcs 7.32 1 min 23 sec was the best >>.crafty 16.6 did it in 3 min 50 sec ,strangly crafty 17.10 never found it in 10 >>mins .junior 6 never found it in 18 mins!!fritz6 never found it in 3 min .all >>this was on a 300 mhz 64 meg hash .in the actual game morphy used 20 min . > >Can you post the position? The game: [Event "?"] [Site "New York USA-ch 4th match"] [Date "1857.??.??"] [Round "6"] [White "Paulsen, L"] [Black "Morphy, P"] [Result "0-1"] [ECO "C48"] [Opening "Four knights"] [Variation "Spanish, classical defence"] 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bc5 5.O-O O-O 6.Nxe5 Re8 7.Nxc6 dxc6 8.Bc4 b5 9.Be2 Nxe4 10.Nxe4 Rxe4 11.Bf3 Re6 12.c3 Qd3 13.b4 Bb6 14.a4 bxa4 15.Qxa4 Bd7 16.Ra2 Rae8 17.Qa6 Qxf3 18.gxf3 Rg6+ 19.Kh1 Bh3 20.Rd1 Bg2+ 21.Kg1 Bxf3+ 22.Kf1 Bg2+ 23.Kg1 Bh3+ 24.Kh1 Bxf2 25.Qf1 Bxf1 26.Rxf1 Re2 27.Ra1 Rh6 28.d4 Be3 0-1 The position before: [D] 4r1k1/p1pb1ppp/Qbp1r3/8/1P6/2Pq1B2/R2P1PPP/2B2RK1 b - - acd 10; acn 4632692; acs 31; ce 42; pv Qf5 d4 Rg6 Be2 Be6 Ra1 Bd5 f3 f6; The position after: [D] 4r1k1/p1pb1ppp/Qbp1r3/8/1P6/2P2q2/R2P1PPP/2B2RK1 w - - acd 12; acn 5253495; acs 31; ce -82; pv gxf3 Rg6+ Kh1 Bh3 Qd3 f5 Qc4+ Kf8 Qh4 Bxf1 h3 Bxh3 Kh2 Rh6 Qg3; This position can be used to determine if a computer uses NULL move pruning or not. I am fairly sure that is what is going on here. Once you make the move, Crafty quickly sees that it is better than its previous choice.
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