Author: John Merlino
Date: 16:19:45 02/03/05
Go up one level in this thread
On February 03, 2005 at 19:00:21, Rob Basham wrote: >On February 03, 2005 at 18:05:49, John Merlino wrote: > >>On February 03, 2005 at 17:44:07, Rob Basham wrote: >> >>>On February 03, 2005 at 14:37:52, Rob Basham wrote: >>> >>>>[D]1b2r1k1/6pp/pp6/7Q/1n2r3/Pq1NB3/1P2P2P/R5RK w - - 0 1 >>>> >>>>Every solution i worked out so far with the computer seems to be a mate in >>>>15..interesting! >>>> >>>>However, None of my programs or engines will ann. a mate until half way >>>>through.. >>>>beginning with >>>>1. Rxg7+ >>>> >>>>Maybe someone can find a shorter mate...:-) >>> >>>CM9000 also says mate in 15..but by a new way! > > >>> >>>there must be about 20 solutions to this...~ >> >>Did you wait until CM9000 announced mate, or did you force a few moves and do a >>little bouncing around yourself? >> >>jm > > >Hi John... > >I just made the moves it was thinking about or calculating... > >no program will ann. mate until close to the end... > >I guess because there are so many possibilities...:-) > >best regards, > >rob After forcing 1.Rxg7+ Kxg7 2.Rg1+ Kf8 3.Qh6+ Ke7 4.Rg7+, it takes CM9_R1 a little over a minute on an AMD 2500 to announce a mate score (Mate in 14). Eventually, after 5:33, it realizes that this is a Mate in 11 (and therefore, from the initial position, it is a Mate in 15). Time Depth Score Positions Moves 0:00 1/3 10.90 1395 4...Qf7 5.Bg5+ Kd7 6.Rxf7+ Kc8 7.Nxb4 0:00 1/4 10.89 5124 4...Qf7 5.Bg5+ Kd7 6.Rxf7+ Kc8 7.Nxb4 R4e6 8.Qxh7 Rxe2 0:00 1/5 15.57 13446 4...Qf7 5.Bg5+ Kd7 6.Rxf7+ Kc8 7.Qxb6 R8e7 8.Bxe7 0:00 1/6 16.05 56634 4...Qf7 5.Bg5+ Kd7 6.Rxf7+ R8e7 7.Nxb4 Bd6 8.Bxe7 Rxe7 9.Rxe7+ Kxe7 10.Qxh7+ Kd8 11.Nxa6 0:00 1/7 16.05 181587 4...Qf7 5.Bg5+ Kd7 6.Rxf7+ R8e7 7.Nxb4 Bd6 8.Bxe7 Rxe7 9.Rxe7+ Kxe7 10.Qxh7+ Kd8 11.Nxa6 0:02 1/8 16.10 731259 4...Qf7 5.Bg5+ Kd7 6.Rxf7+ R8e7 7.Nxb4 Bd6 8.Bxe7 Rxe7 9.Rxe7+ Kxe7 10.Nxa6 Kd7 11.Qxh7+ Kc6 0:07 1/9 18.01 2388364 4...Qf7 5.Bg5+ Kd7 6.Rxf7+ R8e7 7.Nxb4 Bd6 8.Qh3+ Re6 9.Qf3 Bxb4 10.axb4 Rxf7 11.Qxf7+ Kd6 12.Bf4+ Kd5 13.Qf5+ Kc6 14.Qxe6+ Kb5 0:23 1/10 19.55 7720472 4...Qf7 5.Bg5+ Kd7 6.Rxf7+ R8e7 7.Qh3+ Kd6 8.Bxe7+ Rxe7 9.Rf6+ Kc7 10.Nxb4 h5 11.Nd5+ Kb7 12.Nxe7 1:08 1/11 Mate14 23881937 4...Qf7 5.Bg5+ Kd7 6.Rxf7+ R8e7 7.Qh3+ Kd6 8.Bxe7+ Rxe7 9.Rf6+ Kc7 10.Nxb4 Kb7 11.Qg2+ Ka7 12.Nc6+ Kb7 13.Nxe7+ Kc7 14.Qc6+ Kd8 15.Rf8+ Kxe7 16.Re8+ Kf7 17.Qe6+ Kg7 18.Rg8# 2:30 1/12 Mate12 55112223 4...Qf7 5.Bg5+ Kd7 6.Rxf7+ R8e7 7.Qh3+ Kd6 8.Bxe7+ Rxe7 9.Rf6+ Kc7 10.Nxb4 Kb7 11.Qf3+ Re4 12.Qxe4+ Kc8 13.Rf8+ Kd7 14.Qd5+ Ke7 15.Rf7+ Ke8 16.Qd7# 5:33 2/13 Mate11 125780273 4...Qf7 5.Bg5+ Kd7 6.Rxf7+ R8e7 7.Qh3+ Kd6 8.Bxe7+ Rxe7 9.Rf6+ Kc7 10.Nxb4 Kb7 11.Qf3+ Re4 12.Qxe4+ Kc8 13.Rf8+ Kd7 14.Re8 Kd6 15.Qc6# jm
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