Author: John Merlino
Date: 12:07:59 02/18/05
Go up one level in this thread
On February 18, 2005 at 12:50:15, F. Huber wrote: >On February 18, 2005 at 12:20:38, John Merlino wrote: > >>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 > >WOW, Chest (even in brute force) faster than King! - I like that position! ;-) > >FEN: 4k3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w - - 0 1 > >ChestUCI Ver.3.7: >CPU: Celeron 400MHz >FEN: 4k3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w - - >Search for Mate in 10 ... (Hash=50MB) > 6 00:09 221.992 39.641 +M6 1.e4 >Search completed ... (Time=11.43s) >Mate in 6 found ! (00:11) >1.e4 Kf8 2.Qg4 Ke8 3.Qg7 Kd8 4.Bb5 Kc8 5.Bc6 Kd8 6.Qd7# >1 Solution (Mate in 6) > >Regards, >Franz. If I use the brute force mate solver in The King, it finds the Mate in 6 in five seconds on my P4-2.4. Amazing that it takes 10 times longer to find the Mate that is three moves shorter using the normal analysis mode! jm
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