Author: Heiner Marxen
Date: 19:58:22 01/08/02
Go up one level in this thread
On January 08, 2002 at 18:17:01, John Merlino wrote: >On January 07, 2002 at 08:59:28, Robert Basham wrote: > >>Watch this "busy Queen" do a mate in 14 all alone..! >> >>See which computor program can announce the correct number of moves >>in the shortest amount of time, etc. >> >>1. Qe4+ mates... >> >>Junior5 sees "a mate in 13",,,etc. >> >>[D]kq4n1/4p2Q/1P2P3/1K6/8/8/p7/8 w - - > >CM8000 says Mate in 14 in less than one second. If Junior5 says Mate in 13, >what's the line? > >Time Depth Score Positions Moves >0:00 1/3 2.28 3195 1.Qe4+ Qb7 2.Qa4+ Kb8 3.Qf4+ Ka8 > 4.Qf8+ Qb8 5.Qf3+ Qb7 6.Qa3+ Kb8 > 7.Qg3+ Ka8 8.Qxg8+ Qb8 9.Qg2+ Qb7 > 10.Qxa2+ Kb8 >0:00 1/4 2.70 7384 1.Qe4+ Qb7 2.Qa4+ Kb8 3.Qf4+ Ka8 > 4.Qf8+ Qb8 5.Qf3+ Qb7 6.Qa3+ Kb8 > 7.Qg3+ Ka8 8.Qxg8+ Qb8 9.Qg2+ Qb7 > 10.Qxa2+ Kb8 11.Qh2+ Ka8 >0:00 2/5 Mate14 15622 1.Qe4+ Qb7 2.Qa4+ Kb8 3.Qf4+ Ka8 > 4.Qf8+ Qb8 5.Qf3+ Qb7 6.Qa3+ Kb8 > 7.Qg3+ Ka8 8.Qxg8+ Qb8 9.Qg2+ Qb7 > 10.Qxa2+ Kb8 11.Qh2+ Ka8 12.Qh8+ > Qb8 13.Qa1+ Kb7 14.Qa6# >0:00 3/6 Mate14 35532 1.Qe4+ Qb7 2.Qa4+ Kb8 3.Qf4+ Ka8 > 4.Qf8+ Qb8 5.Qf3+ Qb7 6.Qa3+ Kb8 > 7.Qg3+ Ka8 8.Qxg8+ Qb8 9.Qg2+ Qb7 > 10.Qxa2+ Kb8 11.Qh2+ Ka8 12.Qh8+ > Qb8 13.Qa1+ Kb7 14.Qa6# >0:01 4/7 Mate14 85565 1.Qe4+ Qb7 2.Qa4+ Kb8 3.Qf4+ Ka8 > 4.Qf8+ Qb8 5.Qf3+ Qb7 6.Qa3+ Kb8 > 7.Qg3+ Ka8 8.Qxg8+ Qb8 9.Qg2+ Qb7 > 10.Qxa2+ Kb8 11.Qh2+ Ka8 12.Qh8+ > Qb8 13.Qa1+ Kb7 14.Qa6# According to Chest this is a mate in 14, and Qe4+ is the only solution. PV: Qe4+ Qb7 Qa4+ Kb8 Qf4+ Ka8 Qf8+ Qb8 Qf3+ Qb7 Qa3+ Kb8 Qg3+ Ka8 Qxg8+ Qb8 Qg2+ Qb7 Qxa2+ Kb8 Qh2+ Ka8 Qh8+ Qb8 Qa1+ Qa7 Qxa7# (K7/600, 30MB hash, 22.7 min) Maybe Junior is on of those with the off-by-one problem at mate depthes? Cheers, Heiner
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