Author: Steven J. Brann
Date: 06:37:27 10/18/03
Go up one level in this thread
On October 18, 2003 at 07:19:09, Darren Rushton wrote: >[D]qn6/rp1p4/pPkP1R2/K7/2P5/B1pP4/2P1P3/8 w - - 0 1 > >Y. G. Vladimirov >1st Prize Macleod Memorial Tourney 1994 > >Forced mate in 17! > >An amusing problem illustrating the use of pendulum manoeuvres and interferences >to reposition pieces. > >White would like to play Rf8 and Rc8 mate, but must avoid giving stalemate. By >allowing the king to shuttle between c5 and c6 and checking every second move >(otherwise Nc6+ frees the Black forces) White is able to reposition his bishop >at g1 and e2 pawn at e5 to allow the rook to reach f8 via a discovered check. > >The solution is worth close study. >1.Bc1 Kc5 2.Be3+ Kc6 3.Bf4 Kc5 4.Rf5+ Kc6 (If 4…Kd4 5.Rd5 mate) 5.Be5 Kc5 6.Bh2+ >Kc6 (If 6…Kd4 7.Bg1 mate) 7.Rf6 Kc5 8.Bg1+ Kc6 9.e3 Kc5 10.e4+ Kc6 11.Bh2 Kc5 >12.Rf5+ Kc6 (If 12…Kd4 13.Bg1 mate) 13.e5 Kc5 14.Bg1+ Kc6 15.Rf2 Kc5 16.Rf8+ Kc6 >17.Rc8 mate. > >Can a program find it? > >Regards, > >Daz Chessmaster 9000, with default personality SS=12 and 128MB hash finds a forced mate in 19 on a 3.0G P4... But it took lots of time. Time Depth Score Positions Moves 0:00 1/3 0.00 148 1.e3 0:00 1/4 0.00 222 1.e3 0:00 1/5 0.00 281 1.e3 0:00 1/6 0.00 879 1.e3 0:00 1/7 0.00 6140 1.e3 0:00 1/8 0.00 21250 1.e3 0:00 2/9 0.00 54951 1.e3 0:00 2/9 1.24 276083 1.Bc1 Kc5 2.Be3+ Kc6 3.bxa7 b6+ 4.Bxb6 Kb7 5.axb8=Q+ Qxb8 6.e4 Kc6 7.c5 Qg8 0:03 3/10 1.11 1054944 1.Bc1 Kc5 2.Be3+ Kc6 3.bxa7 b6+ 4.Bxb6 Kb7 5.axb8=Q+ Qxb8 6.e4 Kc6 7.c5 Qg8 8.Kb4 Qg5 0:11 4/11 2.25 4333081 1.Bc1 Kc5 2.Be3+ Kc6 3.Bf4 Kc5 4.Rf5+ Kc6 5.Re5 Kxd6 6.Re8+ Kc5 7.Bxb8 d6 8.e3 Kc6 9.Rd8 d5 10.cxd5+ Kc5 11.bxa7 0:35 5/12 7.39 14866909 1.Bc1 Kc5 2.Be3+ Kc6 3.Bf4 Kc5 4.Rf5+ Kc6 5.Re5 Kxd6 6.Re8+ Kc5 7.Bxb8 d6 8.e3 Kc6 9.Rd8 Qxb8 10.Rxb8 Ra8 11.Rxa8 1:59 6/13 7.54 52901535 1.Bc1 Kc5 2.Be3+ Kc6 3.Bf4 Kc5 4.Rf5+ Kc6 5.Re5 Kxd6 6.Re8+ Kc5 7.Bxb8 d6 8.e3 Kc6 9.Rd8 Qxb8 10.Rxb8 Ra8 11.Rxa8 d5 12.Rc8+ Kd7 6:18 7/14 9.79 172293591 1.Bc1 Kc5 2.Be3+ Kc6 3.Bf4 Kc5 4.Rf5+ Kc6 5.Ka4 a5 6.d4 Na6 7.Rb5 Nc5+ 8.Ka3 Qg8 9.d5+ Qxd5 10.cxd5+ Kxb5 11.bxa7 Kc4 12.a8=Q Kxd5 13.Qxa5 21:15 8/15 Mate19 592809680 1.Bc1 Kc5 2.Be3+ Kc6 3.Bf4 Kc5 4.Rf5+ Kc6 5.Be5 Kc5 6.Bg3+ Kc6 7.Rf6 Kc5 8.Bf2+ Kc6 9.e3 Kc5 10.e4+ Kc6 11.Bg3 Kc5 12.Rf5+ Kc6 13.Re5 Kxd6 14.c5+ Kc6 15.Rd5 d6 16.Rxd6+ 1:15:34 9/16 Mate19 2110645314 1.Bc1 Kc5 2.Be3+ Kc6 3.Bf4 Kc5 4.Rf5+ Kc6 5.Be5 Kc5 6.Bg3+ Kc6 7.Rf6 Kc5 8.Bf2+ Kc6 9.e3 Kc5 10.e4+ Kc6 11.Bg3 Kc5 12.Rf5+ Kc6 13.Re5 Kxd6 14.c5+ Kc6 15.Rd5 d6 16.Rxd6+ Steve
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