Author: John Merlino
Date: 09:20:38 02/18/05
Go up one level in this thread
On February 18, 2005 at 08:19:43, José Antônio Fabiano Mendes wrote: > Mate in 6 ==> [D]4k3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w > Source ==> "Amusements in Mathematics", by H.E. Dudeney, Dover, problem #350 This one throws the great mate solver, The King, into a tizzy. Even after forcing the first THREE MOVES, it still takes CM9_R1 over one minute on a P4-2.4 to announce Mate in 3 instead of Mate in 4. After forcing 1.e4 Ke7 2.Qg4 Kd6 3.Qg7 Kc6: Time Depth Score Positions Moves 0:00 1/6 Mate04 40292 4.Nc3 Kb6 5.Nd5+ Kc5 6.Qe7+ Kc6 7.Qc7# 0:00 1/7 Mate04 51764 4.Nc3 Kb6 5.Nd5+ Kc5 6.Qe7+ Kc6 7.Qc7# 0:00 1/8 Mate04 80400 4.Nc3 Kb6 5.Nd5+ Kc5 6.Qe7+ Kc6 7.Qc7# 0:00 2/9 Mate04 164231 4.Nc3 Kb6 5.Nd5+ Kc5 6.Qe7+ Kc6 7.Qc7# 0:01 2/10 Mate04 507497 4.Nc3 Kb6 5.Nd5+ Kc5 6.Qe7+ Kc6 7.Qc7# 0:02 2/11 Mate04 885761 4.Nc3 Kb6 5.Nd5+ Kc5 6.Qe7+ Kc6 7.Qc7# 0:05 3/12 Mate04 1635702 4.Nc3 Kb6 5.Nd5+ Kc5 6.Qe7+ Kc6 7.Qc7# 0:10 3/13 Mate04 4202759 4.Nc3 Kb6 5.Nd5+ Kc5 6.Qe7+ Kc6 7.Qc7# 0:23 3/14 Mate04 10303975 4.Nc3 Kb6 5.Nd5+ Kc5 6.Qe7+ Kc6 7.Qc7# 0:47 4/15 Mate04 17733015 4.Nc3 Kb6 5.Nd5+ Kc5 6.Qe7+ Kc6 7.Qc7# 1:05 4/15 Mate03 22668228 4.d4 Kb6 5.Qd7 Ka5 6.Qb5# 1:05 5/16 Mate03 22672755 4.d4 Kb6 5.Qd7 Ka5 6.Qb5# Of course, the mate solving function finds the Mate in 6 from the root position in just a few seconds, so this one puzzles me.... Apparently, the problem is finding 4.d4, although I can't imagine why that would be difficult, since after that move the Black King has only two legal moves, and it's only a mate in two after that. Bizarre.... jm
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.