Author: Brian Katz
Date: 11:27:01 12/30/03
Do any programs out there find mate in less than 80 moves? The winning idea after winning black’s queens, is to corral the Knights, win two of them, and then get into a K+B+B vs K+N 5 piece Tablebase endgame, which in some positions, require at least 74 moves. Perhaps more. If you don't have the 5 piece Tablebases, your program probably will not find mate. You will need at least the 5 piece endgame mentioned above. You may need to set the Tablebase Depth to a setting of 0 rather than the Default setting of 3. [D]n5Kn/8/7k/B6n/8/2B5/2Bq4/4q3 w Analysis by Fritz 8: Tablebase Depth set at 0. Hardware: AMD Athlon XP 2600+ 1 Gig DDR SDRAM 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Nd5 5.Bb3 Ne7 6.Beg3 +- (7.22) Depth: 7/12 00:00:00 18kN, tb=45 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Nd5 5.Bb3 Ne7 6.Beg3 +- (7.22) Depth: 8/14 00:00:00 26kN, tb=46 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Nd5 5.Bb3 Ne7 6.Beg3 +- (7.22) Depth: 9/16 00:00:00 42kN, tb=71 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Be4 Nd5 6.Bxd5 Kxf4 +- (7.22) Depth: 10/21 00:00:00 88kN, tb=220 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Be4 Nc4 6.Beg3 Kh5 7.Kg7 +- (7.28) Depth: 11/21 00:00:00 197kN, tb=529 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Bf2 Nd5 6.Bb3 Nc3 7.Be6+ Kf3 8.Be5 +- (7.28) Depth: 12/23 00:00:00 467kN, tb=1594 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Bf2 Nd5 6.Be5 Kf3 7.Bfd4 Ne3 8.Bd3 +- (7.31) Depth: 13/25 00:00:00 1018kN, tb=4800 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Bf2 Nd5 6.Be5 Kf3 7.Bfd4 Ne7 8.Bd3 Nd5 +- (7.41) Depth: 14/26 00:00:02 2134kN, tb=11604 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Bf2 Nd5 6.Be5 Kf3 7.Bfd4 Nb4 8.Bf5 Nd5 9.Kg7 +- (7.44) Depth: 15/29 00:00:04 4887kN, tb=31168 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Bf2 Nd5 6.Be5 Kf3 7.Bfd4 Nb4 8.Bf5 Nd5 9.Kg7 Nf4 +- (7.50) Depth: 16/29 00:00:09 10238kN, tb=72603 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Bf2 Nc4 6.Be4 Nb2 7.Bd4 Nc4 8.Kg7 +- (7.56) Depth: 17/32 00:00:25 26904kN, tb=234367 1.Bxd2+! +- (7.84) Depth: 18/33 00:00:34 36314kN, tb=355809 1.Bxd2+! +- (8.13) Depth: 18/35 00:00:54 57493kN, tb=596406 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Ba5 Nd7 5.Kxh8 Nc5 6.Bb6 Nd7 7.Kg7 Kg4 +- (8.16) Depth: 18/35 00:01:02 66117kN, tb=688821 1.Bxd2+! +- (8.44) Depth: 19/37 00:01:09 73772kN, tb=767130 1.Bxd2+! +- (8.72) Depth: 19/37 00:01:10 74411kN, tb=798334 1.Bxd2+! +- (9.28) Depth: 19/37 00:01:12 76918kN, tb=865923 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Ba5 Nc4 5.Kxh8 Kg4 6.Bd1+ Kf5 7.Be2 Nb2 8.Bc1 Na4 9.Ba3 Ke4 10.Bd1 +- (9.59) Depth: 19/40 00:02:17 156703kN, tb=1772123 1.Bxd2+! +- (9.88) Depth: 20/39 00:02:28 168406kN, tb=1892491 1.Bxd2+! +- (10.16) Depth: 20/39 00:02:30 171306kN, tb=1973122 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Ba5 Nc4 5.Kxh8 Kg4 6.Bac7 Kf3 7.Bc1 Ke2 +- (10.22) Depth: 20/39 00:04:10 291849kN, tb=3152989 1.Bxd2+! +- (10.50) Depth: 21/37 00:04:33 317648kN, tb=3419102 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Ba5 Nc4 6.Bac7 Kf3 7.Bc1 Ke2 8.Be4 +- (10.56) Depth: 21/40 00:09:02 634177kN, tb=7029727 1.Bxd2+! +- (10.84) Depth: 22/39 00:09:45 683693kN, tb=7568689 1.Bxd2+! +- (11.13) Depth: 22/39 00:09:52 691043kN, tb=7790120 1.Bxd2+! +- (11.69) Depth: 22/39 00:09:53 692672kN, tb=7915129 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Ba5 Nd7 6.Bd8 +- (#80) Depth: 22/42 00:15:05 1096525kN, tb=12784411 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Ba5 Nd7 6.Bd8 +- (#80) Depth: 22/42 00:15:24 1119467kN, tb=12908527 (Katz, Eatontown 30.12.2003) Brian
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