Author: Mike Hood
Date: 15:11:21 12/30/03
Go up one level in this thread
On December 30, 2003 at 14:27:01, Brian Katz wrote: >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 Hi Brian! On my Pentium III-733 (128 MB Cache) Shredder eventually evaluates the position as Mate in 75 after 124 minutes. I've stopped the analysis now, but maybe somebody with a faster PC would like to follow it up. Analysis by Shredder 7.04: 1.Bxd2+ Qxd2 -+ (-14.07) Depth: 1/2 00:00:00 1.Bxd2+ Qe3 -+ (-11.40) Depth: 1/4 00:00:00 1.Bxd2+ Qxd2 2.Bxd2+ Nf4 3.Bxf4+ Kh5 4.Kxh8 +- (5.22) Depth: 1/7 00:00:00 1.Bxd2+ Qxd2 2.Bxd2+ Nf4 3.Bxf4+ Kh5 4.Kxh8 +- (5.22) Depth: 2/2 00:00:00 1.Bxd2+ Qxd2 2.Bxd2+ Nf4 3.Bxf4+ Kh5 4.Kxh8 +- (5.22) Depth: 3/4 00:00:00 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bd1+ Qxd1 +- (4.97) Depth: 4/6 00:00:00 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bd1+ Qxd1 +- (4.47) Depth: 4/6 00:00:00 1.Bxd2+ Qxd2 2.Bxd2+ Nf4 3.Bxf4+ Kh5 4.Kxh8 +- (5.22) Depth: 4/7 00:00:00 1.Bxd2+ Nf4 2.Kxh8 Kh5 3.Bd1+ Qxd1 +- (4.97) Depth: 5/8 00:00:00 1.Bxd2+ Nf4 2.Kxh8 Kh5 3.Bd1+ Qxd1 +- (4.47) Depth: 5/8 00:00:00 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Kg4 4.Kxh8 Kxf4 +- (4.89) Depth: 5/10 00:00:00 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Nc4 +- (8.25) Depth: 6/8 00:00:00 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Nd5 +- (8.47) Depth: 6/9 00:00:00 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Bd1+ Kg6 5.Kxh8 +- (8.45) Depth: 7/10 00:00:00 2kN, tb=7 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Kg7 Nc4 +- (8.57) Depth: 8/12 00:00:00 3kN, tb=47 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Bh4 Nd5 +- (8.48) Depth: 9/14 00:00:00 10kN, tb=130 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Be4 Nd7 6.Bh4 Nc5 +- (8.61) Depth: 10/20 00:00:00 36kN, tb=1245 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Be4 Nd7 6.Kg7 Nc5 7.Bd5 Nd3 +- (8.68) Depth: 11/18 00:00:01 57kN, tb=1961 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Bb3 Kf3 6.Ba5 Nd7 7.Bd5+ Ke2 8.Kg7 Nc5 +- (8.76) Depth: 12/22 00:00:01 119kN, tb=6189 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Ba5 Nd5 6.Be4 Nf6 7.Bc6 Kf5 8.Bc3 Ne4 9.Bd4 Nf2 10.Bxf2 Kxf4 +- (8.83) Depth: 13/22 00:00:02 271kN, tb=13238 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Ba5 Nc4 6.Bd3 Nb2 7.Be2+ Kf5 8.Be5 Na4 9.Bd3+ Ke6 10.Bd4 Kd6 +- (8.90) Depth: 14/26 00:00:05 564kN, tb=26194 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Ba5 Nc8 6.Bd6 Kg5 7.Ba4 Kg4 8.Bd7+ Kg5 +- (9.13) Depth: 15/30 00:00:09 1332kN, tb=58672 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Ba5 Nc8 6.Bd6 Kg5 7.Ba4 Ne7 8.Bxe7+ +- (9.38) Depth: 16/28 00:00:11 1705kN, tb=76121 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Nc8 5.Kg7 Kg4 6.Bf2 Kf3 7.Kf6 Ke2 8.Bf5 Kd1 9.Bxc8 +- (9.88) Depth: 16/32 00:00:20 3727kN, tb=141832 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Ba5 Nc4 6.Bd3 Nb2 7.Be2+ Kf5 8.Bc1 Na4 9.Ba3 Ke4 10.Bb5 Nc5 11.Bxc5 Kd5 12.Bab6 Ke6 13.Kg7 Kf5 +- (12.11) Depth: 16/38 00:00:49 12295kN, tb=276296 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Ba5 Nc4 6.Bd3 Nb2 7.Be2+ Kh3 8.Be5 Na4 9.Bd4 Kg2 10.Bb5 Kf3 11.Bxa4 Ke4 12.Bc5 Kd3 13.Kg7 Kc4 14.Ba3 Kd5 15.Kf6 +- (12.25) Depth: 17/38 00:01:11 17882kN, tb=356712 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Ba5 Nc4 6.Bd3 Nb2 7.Be2+ Kh3 8.Be5 Na4 9.Bd4 Kg2 10.Bb5 Nc5 11.Bxc5 Kh3 +- (12.50) Depth: 18/36 00:01:15 18753kN, tb=379907 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Bb3 Kf5 6.Bf2 Nc8 7.Bc5 Nb6 8.Bxb6 +- (13.00) Depth: 18/40 00:02:55 43088kN, tb=663326 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Nc8 5.Kg7 Kg4 6.Bf2 Ne7 7.Be4 Kxf4 +- (#78) Depth: 18/40 00:02:59 43851kN, tb=699013 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Nc8 5.Kg7 Kg4 6.Bf2 Ne7 7.Be4 Kxf4 +- (#78) Depth: 19/19 00:03:00 43863kN, tb=699013 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Nc8 5.Kg7 Kg4 6.Bf2 Ne7 7.Be4 Kxf4 +- (#78) Depth: 20/20 00:03:00 43875kN, tb=699013 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Nc8 5.Kg7 Kg4 6.Bf2 Ne7 7.Be4 Kxf4 +- (#78) Depth: 21/21 00:03:02 43894kN, tb=699013 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Nc8 5.Kg7 Kg4 6.Bf2 Ne7 7.Be4 Kxf4 +- (#78) Depth: 22/22 00:03:02 43921kN, tb=699015 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Nc8 5.Kg7 Kg4 6.Bf2 Ne7 7.Be4 Kxf4 +- (#78) Depth: 23/23 00:03:03 43957kN, tb=699273 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Nc8 5.Kg7 Kg4 6.Bf2 Ne7 7.Be4 Kxf4 +- (#78) Depth: 24/24 00:03:04 44016kN, tb=699727 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Nc8 5.Kg7 Kg4 6.Bf2 Ne7 7.Be4 Kxf4 +- (#78) Depth: 25/25 00:03:04 44129kN, tb=700322 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Nc8 5.Kg7 Kg4 6.Bf2 Ne7 7.Be4 Kxf4 +- (#78) Depth: 26/28 00:03:06 44371kN, tb=704779 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Nc8 5.Kg7 Kg4 6.Bf2 Ne7 7.Be4 Kxf4 +- (#78) Depth: 27/28 00:03:09 44793kN, tb=714482 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Bb3 Na8 6.Bf2 Kf5 7.Bd5 Kg4 8.Bxa8 +- (#79) Depth: 28/34 00:03:16 45644kN, tb=743425 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Nc8 5.Kg7 Kg4 6.Bf2 Ne7 7.Be4 Kxf4 +- (#78) Depth: 29/36 00:03:24 47161kN, tb=802505 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Nc8 5.Kg7 Kg4 6.Bf2 Ne7 7.Be4 Kxf4 +- (#78) Depth: 30/32 00:03:31 48334kN, tb=829674 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Nc8 5.Bf2 Kg4 6.Bc5 Kxf4 +- (#76) Depth: 31/34 00:03:44 50330kN, tb=878400 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Bb3 Kf5 6.Bf2 Nc8 7.Bc5 Kf6 8.Bd5 Kf5 9.Kg7 Kg4 10.Bb7 Kf5 11.Bxc8+ +- (#77) Depth: 32/36 00:04:07 54730kN, tb=1043986 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Bb3 Kf5 6.Bf2 Nd7 7.Kg7 Kxf4 8.Bd1 +- (#76) Depth: 33/38 00:04:32 59440kN, tb=1186665 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Bb3 Kf5 6.Bf2 Nd7 7.Kg7 Nf6 8.Kf7 Ne4 9.Bc2 Kxf4 10.Bxe4 +- (#76) Depth: 34/40 00:05:04 64894kN, tb=1340520 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Bb3 Kxf4 +- (#76) Depth: 35/40 00:05:48 72418kN, tb=1530021 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Bb3 Kxf4 +- (#76) Depth: 36/42 00:06:42 82037kN, tb=1766762 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Bb3 Kxf4 +- (#76) Depth: 37/42 00:08:08 97786kN, tb=2216473 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Bb3 Kxf4 +- (#76) Depth: 38/42 00:10:19 122284kN, tb=2951108 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Bb3 Kxf4 +- (#76) Depth: 39/43 00:13:22 160923kN, tb=4030342 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Bb3 Kxf4 +- (#76) Depth: 40/42 00:19:43 238966kN, tb=6528679 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Bb3 Kxf4 +- (#76) Depth: 41/41 00:31:34 377306kN, tb=12180837 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Bb3 Kxf4 +- (#76) Depth: 42/44 00:49:15 594269kN, tb=20145569 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Kxh8 Kg4 5.Bb3 Kxf4 +- (#76) Depth: 43/43 01:13:14 872875kN, tb=31177817 1.Bxd2+ Nf4 2.Bxf4+ Kh5 3.Bxe1 Nb6 4.Ba5 Nc4 5.Bd3 Kg4 6.Bxc4 Ng6 7.Kf7 Nh4 8.Bg3 Nf3 9.Be2 Kxg3 +- (#75) Depth: 44/44 02:04:52 1498953kN, tb=56206971
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