Author: John Merlino
Date: 08:25:45 09/04/02
Go up one level in this thread
On September 04, 2002 at 02:34:48, Eduard Nemeth wrote: >[D]B2k4/KPpP4/n1Pb4/P5p1/5p2/5P2/8/8 b - - 0 1 > >Which program see a mate in 20 moves? > >Eduard Chessmaster 9000 announces Mate in 21 in 50 seconds on my PIII-733. However, it takes just over four minutes to announce Mate in 20. Note that the maximum reported PV length is 31 ply in Chessmaster, which is why the PVs below do not show the entire mating sequence: Time Depth Score Positions Moves 0:00 2/7 3.38 19087 1...Nb8 2.Kxb8 Bc5 3.a6 g4 4.fxg4 f3 5.a7 0:00 3/8 0.00 24495 1...Nb8 2.Kxb8 Bc5 3.a6 g4 4.a7 gxf3 0:00 4/9 0.00 43551 1...Nb8 2.Kxb8 Bc5 3.a6 g4 4.a7 gxf3 0:00 5/10 -1.65 48235 1...Nb8 2.Kxb8 Bc5 3.a6 Bd4 4.a7 g4 5.fxg4 f3 6.g5 f2 7.g6 f1=Q 8.g7 Bxa7+ 9.Kxa7 Qg1+ 10.Kb8 Qxg7 11.Ka7 Qd4+ 12.Kb8 0:00 6/11 -3.80 57616 1...Nb8 2.Kxb8 Bc5 3.a6 Bd4 4.a7 g4 5.fxg4 f3 6.g5 f2 7.g6 f1=Q 8.g7 Bxa7+ 9.Kxa7 Qg1+ 10.Kb8 Qxg7 11.Ka7 Qa1+ 12.Kb8 Qb2 13.Ka7 Qb6+ 14.Kb8 Qxc6 0:01 7/12 -5.64 82756 1...Nb8 2.Kxb8 Bc5 3.a6 Bd4 4.a7 g4 5.fxg4 f3 6.g5 f2 7.g6 f1=Q 8.g7 Bxa7+ 9.Kxa7 Qg1+ 10.Kb8 Qxg7 11.Ka7 Qa1+ 12.Kb8 Qb2 13.Ka7 Qb6+ 14.Kb8 Qxc6 15.Ka7 Qb6+ 16.Kb8 Kxd7 0:01 8/13 -5.64 140917 1...Nb8 2.Kxb8 Bc5 3.a6 Bd4 4.a7 g4 5.fxg4 f3 6.g5 f2 7.g6 f1=Q 8.g7 Bxa7+ 9.Kxa7 Qg1+ 10.Kb8 Qxg7 11.Ka7 Qa1+ 12.Kb8 Qb2 13.Ka7 Qb6+ 14.Kb8 Qxc6 15.Ka7 Qb6+ 16.Kb8 Kxd7 0:02 9/14 -5.60 257724 1...Nb8 2.Kxb8 Bc5 3.a6 Bd4 4.a7 g4 5.fxg4 f3 6.g5 f2 7.g6 f1=Q 8.g7 Bxa7+ 9.Kxa7 Qg1+ 10.Kb8 Qxg7 11.Ka7 Qa1+ 12.Kb8 Qb2 13.Ka7 Qb6+ 14.Kb8 Qxc6 15.Ka7 Qb6+ 16.Kb8 Qb3 0:05 10/15 -5.60 586805 1...Nb8 2.Kxb8 Bc5 3.a6 Bd4 4.a7 g4 5.fxg4 f3 6.g5 f2 7.g6 f1=Q 8.g7 Bxa7+ 9.Kxa7 Qg1+ 10.Kb8 Qxg7 11.Ka7 Qa1+ 12.Kb8 Qb2 13.Ka7 Qb6+ 14.Kb8 Qxc6 15.Ka7 Qb6+ 16.Kb8 Qb3 0:11 11/16 -5.60 1369630 1...Nb8 2.Kxb8 Bc5 3.a6 Bd4 4.a7 g4 5.fxg4 f3 6.g5 f2 7.g6 f1=Q 8.g7 Bxa7+ 9.Kxa7 Qg1+ 10.Kb8 Qxg7 11.Ka7 Qa1+ 12.Kb8 Qb2 13.Ka7 Qb6+ 14.Kb8 Qxc6 15.Ka7 Qb6+ 16.Kb8 Qb3 0:24 12/17 -5.99 3068363 1...Nb8 2.Kxb8 Bc5 3.a6 Bd4 4.a7 g4 5.fxg4 f3 6.g5 f2 7.g6 f1=Q 8.g7 Bxa7+ 9.Kxa7 Qg1+ 10.Kb8 Qxg7 11.Ka7 Qa1+ 12.Kb8 Qb2 13.Ka7 Qb6+ 14.Kb8 Qxc6 15.Ka7 Qb6+ 16.Kb8 Qb3 0:50 13/18 -Mate21 6508769 1...Nb8 2.Kxb8 Bc5 3.a6 Bd4 4.a7 g4 5.fxg4 f3 6.g5 f2 7.g6 f1=Q 8.g7 Bxa7+ 9.Kxa7 Qg1+ 10.Kb8 Qxg7 11.Ka7 Qa1+ 12.Kb8 Qb2 13.Ka7 Qb6+ 14.Kb8 Qxc6 15.Ka7 Qb6+ 16.Kb8 Qb3 1:50 14/19 -Mate21 14688579 1...Nb8 2.Kxb8 Bc5 3.a6 Bd4 4.a7 g4 5.fxg4 f3 6.g5 f2 7.g6 f1=Q 8.g7 Bxa7+ 9.Kxa7 Qg1+ 10.Kb8 Qxg7 11.Ka7 Qa1+ 12.Kb8 Qb2 13.Ka7 Qb6+ 14.Kb8 Qxc6 15.Ka7 Qb6+ 16.Kb8 Qb3 4:06 15/20 -Mate20 33464594 1...Nb8 2.Kxb8 Bc5 3.a6 Bd4 4.a7 g4 5.fxg4 f3 6.g5 f2 7.g6 f1=Q 8.g7 Bxa7+ 9.Kxa7 Qg1+ 10.Kb8 Qxg7 11.Ka7 Qa1+ 12.Kb8 Qb2 13.Ka7 Qb6+ 14.Kb8 Qxc6 15.Ka7 Qa4+ 16.Kb8 Qxd7 jm
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