Author: F. Huber
Date: 13:31:39 01/09/05
Go up one level in this thread
On January 09, 2005 at 16:14:35, Matthew Hull wrote: >On January 09, 2005 at 10:48:23, F. Huber wrote: > >>On January 09, 2005 at 09:28:15, Matthew Hull wrote: >> >>>Composed by J. N. Babson, Seattle, Washington, in 1878. >>> >>>Black -- 16 pieces >>>White -- 16 pieces >>> >>>Either White or Black to play and checkmate, or compel his adversary to >>>checkmate in eleven moves. >>> >>>[D]Nb1QN3/1pp1PPp1/1rnn1p1P/1Pkr2B1/P1pRpK1p/2P1P2B/2qb2Pp/4R3 w - - 0 1 >> >>Hi Matthew, >> >>that´s really an amazing position! >> >>I´ve now checked all 4 cases and can confirm three of them: >> >>Nb1QN3/1pp1PPp1/1rnn1p1P/1Pkr2B1/P1pRpK1p/2P1P2B/2qb2Pp/4R3 b - - bm #11; 00:00 >>@ C3/K5/P3/X6; >>Nb1QN3/1pp1PPp1/1rnn1p1P/1Pkr2B1/P1pRpK1p/2P1P2B/2qb2Pp/4R3 w - - bm s#11; 00:00 >>@ C1/K2/P2/X2; >>Nb1QN3/1pp1PPp1/1rnn1p1P/1Pkr2B1/P1pRpK1p/2P1P2B/2qb2Pp/4R3 b - - bm s#11; 00:02 >>@ C1/K5/P3/X4; >> >>So both selfmates in 11 are ok, and also the mate in 11 if it´s blacks turn - >>but if white has to move it seems to be only a mate in 12!? >> >>Nb1QN3/1pp1PPp1/1rnn1p1P/1Pkr2B1/P1pRpK1p/2P1P2B/2qb2Pp/4R3 w - - bm #12; 00:00 >>@ C3/K4/P2/X3; >> >>I´ve tested this with Chest, King and GoliathMate - Gustav failed because it >>doesn´t accept this position as legal. >>Of course I´ve not tried it yet with Chest in brute-force mode (this would >>take too long on my slow notebook), but I´m quite sure that this #12 is >>indeed the shortest possible. >>But if you have a solution in 11 moves, please post the mainline here - >>maybe then I could check it again with Chest. > > >Wow! That's and incredible verification for the three problems, all composed >nearly a century before an adequate computer could be expected to verify it. > >I have never seen this problem published except in the July-August, 1924, Vol. >21 of The American Chess Bulletin. None of the subsequent issues contain a >solution, which according to the author, had never been correctly submitted up >to that date, though TACB stated that it had "an exhausting analysis of the >position" from the author in its possesion. So I've never seen the solution >published. Oh, there are really no solutions available for this fantastic problem? Well, then I think I should post them ... ;-) All done on: ------------ ChestUCI Ver.3.7: CPU: Celeron 400MHz Mate in 12 for White: --------------------- FEN: Nb1QN3/1pp1PPp1/1rnn1p1P/1Pkr2B1/P1pRpK1p/2P1P2B/2qb2Pp/4R3 w - - Search for Special-Mate [C3/K4/P2/X3] in 12 ... (Hash=32MB) 12 00:00 0 0 +M12 1.Rxd5+ Search completed ... (Time=0.17s) Mate in 12 found ! (1 Solution in 00:00) 12/12 00:00 4.147 24.394 +M12 1.Rxd5+ Kxd5 2.Nexc7+ Bxc7 3.Nxc7+ Kc5 4.Qxd6+ Kxd6 5.e8N+ Ke7 6.f8Q+ Kxf8 7.hxg7+ Ke7 8.Bxf6+ Kf7 9.Be6+ Kg6 10.g8Q+ Kh6 11.Qg7+ Kh5 12.Qg5+ Best move: Rxd5, Value: +Mate in 12, Depth: 12/12, Time: 00:00,831, 4.147 Nodes, 24.394 N/sec Mate in 11 for Black: --------------------- FEN: Nb1QN3/1pp1PPp1/1rnn1p1P/1Pkr2B1/P1pRpK1p/2P1P2B/2qb2Pp/4R3 b - - Search for Special-Mate [C3/K5/P3/X6] in 11 ... (Hash=32MB) 11 00:01 0 0 +M11 1. ... fxg5+ 11 00:01 0 0 +M11 1. ... Bxe3+ Search completed ... (Time=0.94s) Mate in 11 found ! (2 Solutions in 00:00) 11/11 00:01 16.950 18.031 +M11 1. ... Bxe3+ 2.Rxe3 fxg5+ 3.Kg4 Ne5+ 4.Kh5 g6+ 5.Kxg5 Ndxf7+ 6.Kf4 g5+ 7.Kf5 Nxh6+ 8.Kxg5 Qxg2+ 9.Rg3 Qxg3+ 10.Kh5 Qg6+ 11.Kxh4 Nf3+ 11/11 00:01 16.950 18.031 +M11 1. ... fxg5+ 2.Kg4 Ne5+ 3.Kh5 g6+ 4.Kxg5 Bxe3+ 5.Rxe3 Ndxf7+ 6.Kf4 g5+ 7.Kf5 Nxh6+ 8.Kxg5 Qxg2+ 9.Rg3 Qxg3+ 10.Kh5 Qg6+ 11.Kxh4 Nf3+ Best move: fxg5, Value: +Mate in 11, Depth: 11/11, Time: 00:01,425, 16.950 Nodes, 18.031 N/sec SelfMate in 11 for White: ------------------------- FEN: Nb1QN3/1pp1PPp1/1rnn1p1P/1Pkr2B1/P1pRpK1p/2P1P2B/2qb2Pp/4R3 w - - Search for Special-SelfMate [C1/K2/P2/X2] in 11 ... (Hash=32MB) 11 00:00 0 0 -M11 1.Rxd5+ Search completed ... (Time=0.05s) SelfMate in 11 found ! (1 Solution in 00:00) 11/11 00:00 2.041 40.820 -M11 1.Rxd5+ Kxd5 2.Qxd6+ cxd6 3.Nxf6+ gxf6 4.Nxb6+ Kc5 5.Nd7+ Kd5 6.Nxf6+ Kc5 7.Nd7+ Kd5 8.Be6+ Kxe6 9.e8Q+ Ne7 10.Qxe7+ Kd5 11.Qxe4+ Qxe4+ Best move: Rxd5, Value: -Mate in 11, Depth: 11/11, Time: 00:00,506, 2.041 Nodes, 40.820 N/sec SelfMate in 11 for Black: ------------------------- FEN: Nb1QN3/1pp1PPp1/1rnn1p1P/1Pkr2B1/P1pRpK1p/2P1P2B/2qb2Pp/4R3 b - - Search for Special-SelfMate [C1/K5/P3/X4] in 11 ... (Hash=32MB) 11 00:02 30.420 39.506 -M11 1. ... fxg5+ Search completed ... (Time=2.64s) SelfMate in 11 found ! (1 Solution in 00:02) 11/11 00:02 133.157 50.438 -M11 1. ... fxg5+ 2.Kg4 Ne5+ 3.Kxg5 Ndxf7+ 4.Kh5 g6+ 5.Kxh4 Bxe1+ 6.g3 Nf3+ 7.Kg4 N7e5+ 8.Kf4 g5+ 9.Kf5 Nf7+ 10.Kg4 Nxh6+ 11.Kh5 g4+ 12.Qxd5+ Best move: fxg5, Value: -Mate in 11, Depth: 11/11, Time: 00:03,067, 133.157 Nodes, 50.438 N/sec Best regards, Franz.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.