Author: Mike Byrne
Date: 21:25:20 11/01/03
Go up one level in this thread
On November 01, 2003 at 16:17:30, John Merlino wrote: >On November 01, 2003 at 09:22:28, Art Basham wrote: > >>[D]8/5pk1/1Q3bp1/P6p/7P/5KP1/1r3P2/8 w - - 0 1 >> >>How many ply to find 1. QXR...!? >> >>Fritz7 takes 13 ply...(some programs only 11 ply...Phallanx20 = 8ply)... >> >>This is too difficult for most table top machines! >> >>RISC finds it in about 20 minutes! > >Chessmaster 9000, on a P4-2.4, finds Rxb2 in 22 seconds. But then there's a long >fail-high on Qd6 that doesn't resolve until after five minutes: > >Time Depth Score Positions Moves >0:00 1/5 2.94 8913 1.Qd6 Ra2 2.a6 Ra5 3.Kg2 >0:00 1/6 2.98 21700 1.Qd6 Rb3+ 2.Kg2 Rb1 3.a6 Ra1 4.Kf3 > Ra4 >0:00 1/7 3.01 53613 1.Qd6 Ra2 2.a6 Ra5 3.Kg2 Be5 4.Qc6 > Bd4 >0:00 1/8 3.08 96152 1.Qd6 Ra2 2.a6 Ra5 3.Kg2 Be5 4.Qb6 > Ra1 5.Qb7 >0:01 1/9 3.16 228449 1.Qd6 Ra2 2.a6 Ra5 3.Qb6 Ra3+ 4.Ke4 > Ra4+ 5.Kd5 Ra2 6.a7 Rd2+ 7.Kc6 >0:02 1/10 3.19 484021 1.Qd6 Ra2 2.a6 Ra4 3.Qc6 Ra3+ 4.Ke4 > Ra2 5.f3 Ra5 6.f4 Ra3 >0:05 2/11 3.23 1085916 1.Qd6 Ra2 2.a6 Ra4 3.Qc6 Ra3+ 4.Ke4 > Ra2 5.Qb7 Re2+ 6.Kf3 Ra2 7.a7 Ra3+ > 8.Ke4 Ra4+ 9.Kd5 >0:12 3/12 3.23 2601315 1.Qd6 Ra2 2.a6 Ra4 3.Qc6 Ra3+ 4.Ke4 > Ra2 5.Qb7 Ra4+ 6.Kd5 Rd4+ 7.Kc6 > Rd2 8.f3 Rd8 >0:22 3/12 4.08 4907444 1.Qxb2 Bxb2 2.Ke4 Ba3 3.Kd5 Bb4 > 4.a6 Be1 5.a7 Bxf2 6.a8=Q Bxg3 > 7.Qa1+ f6 8.Qa7+ Kg8 >0:23 4/13 4.19 5181445 1.Qxb2 Bxb2 2.Ke4 Ba3 3.Kd5 Bb4 > 4.a6 Be1 5.a7 Bxf2 6.a8=Q Bxg3 > 7.Qd8 f5 8.Qe7+ Kg8 >0:31 5/14 4.17 7486875 1.Qxb2 Bxb2 2.Ke4 f5+ 3.Kd5 Bc3 > 4.a6 Be1 5.a7 Bxf2 6.a8=Q Bxg3 > 7.Qb7+ Kf6 8.Qc6+ Kf7 9.Qe6+ Kg7 > 10.Qe7+ Kg8 11.Qf6 Kh7 >0:57 6/15 4.38 13861181 1.Qxb2 Bxb2 2.Ke4 f5+ 3.Kd5 Bc3 > 4.a6 Be1 5.a7 Bxf2 6.a8=Q Bxg3 > 7.Qb7+ Kh6 8.Qe7 f4 9.Qg5+ Kg7 > 10.Ke4 Kf7 11.Qd5+ Kg7 >5:05 6/15 4.79 75338035 1.Qd6 Ra2 2.a6 Ra4 3.Kg2 Bd4 4.Qf4 > Kg8 5.a7 Rxa7 6.Qxd4 Ra3 7.Qd7 > Ra2 8.Kf3 Rb2 > >jm Pocket Chess Genius 1.5 Dell Axim 400 oc to 600 Mhz 16 MB Hash Rom A05 Wm 2003 finds Qxb2 in 35 seconds on the 11 ply w/ +4 score averaging about 93k nps
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