Author: George Tsavdaris
Date: 04:38:39 10/18/03
Go up one level in this thread
On October 18, 2003 at 07:31:20, George Tsavdaris wrote: >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? >> >Chessmaster 9000 XXX (a personality of mine), can find the move in 37 seconds >on a PIV 1500MHz with 32MB hash. I'm sure default CM9000 can find it also very >quick. And indeed "CM9000 default" finds this in 1 second on the same hardware! CM9000 Default analysis: Time Depth Score Positions Moves 0:00 1/7 0.00 6140 1.e2-e3 0:00 1/8 0.00 21250 1.e2-e3 0:00 2/9 0.00 54951 1.e2-e3 0:01 2/9 1.24 276083 1.Ba3-c1 Kc6-c5 2.Bc1-e3+ Kc5-c6 3.b6xa7 b7-b6+ 4.Be3xb6 Kc6-b7 5.a7xb8=Q+ Qa8xb8 6.e2-e4 Kb7-c6 7.c4-c5 Qb8-g8 0:06 3/10 1.11 1055388 1.Ba3-c1 Kc6-c5 2.Bc1-e3+ Kc5-c6 3.b6xa7 b7-b6+ 4.Be3xb6 Kc6-b7 5.a7xb8=Q+ Qa8xb8 6.e2-e4 Kb7-c6 7.c4-c5 Qb8-g8 8.Ka5-b4 Qg8-g5 0:26 4/11 2.25 4421090 1.Ba3-c1 Kc6-c5 2.Bc1-e3+ Kc5-c6 3.Be3-f4 Kc6-c5 4.Rf6-f5+ Kc5-c6 5.Rf5-e5 Kc6xd6 6.Re5-e8+ Kd6-c5 7.Bf4xb8 d7-d6 8.e2-e3 Kc5-c6 9.Re8-d8 d6-d5 10.c4xd5+ Kc6-c5 11.b6xa7 1:17 5/12 7.39 15003345 1.Ba3-c1 Kc6-c5 2.Bc1-e3+ Kc5-c6 3.Be3-f4 Kc6-c5 4.Rf6-f5+ Kc5-c6 5.Rf5-e5 Kc6xd6 6.Re5-e8+ Kd6-c5 7.Bf4xb8 d7-d6 8.e2-e3 Kc5-c6 9.Re8-d8 Qa8xb8 10.Rd8xb8 Ra7-a8 11.Rb8xa8
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