Author: Heiner Marxen
Date: 08:38:49 02/28/01
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On February 27, 2001 at 22:16:27, Paul wrote: >On February 27, 2001 at 17:23:47, Heiner Marxen wrote: > >>>On February 27, 2001 at 04:32:01, Paul wrote: > >>>>[D]8/7b/8/8/7p/1pp5/7Q/k1K1N3 w - - 0 1 >>>> >>>>This is also a forced mate, but a bit deeper than the other one ... enjoy! :) >> >>Hmm, could someone please give a PV after 1.Nc2+ Ka2 2.Nb4+ Ka3 ? >>What is the intended winning line? >>Chest does not see any mate in 12 to follow. > >Well ... since no one else volunteers, this someone could do that :) > >It's at most a mate in 17 in Pretz's humble opinion, so I hope those 12 moves >went quickly otherwise there's no chance of Chest finding it :) The PV is kind >of strange coz of some well known EGTB effects I haven't fixed yet: > >1. Nc2+ Ka2 2. Nb4+ Ka3 3. Nd3 Bxd3 4. Qd6+ Ka4 5. Qxd3 b2+ 6. Kc2 b1=Q+ 7. Kxb1 >Kb4 8. Qh3 Kc4 9. Qxh4+ Kc5 10. Qf6 Kd5 11. Kc2 Kc5 12. Kxc3 Kd5 13. Qe7 Kc6 14. >Kc4 Kb6 15. Qd7 Ka6 16. Kc5 Ka5 17. Qa7# > >Groetjes, >Paul Thanks! Since Dieter and Yace also found a #17, chances are this is so deep. The mate in 12 needed 20 minutes (K6-3/400, 60MB hash), with an effective branching factor around 4. So the #15 left after the first two moves would need around a day :-( My own box is currently busy with the simulation of a Turing Machine, so I will drop this problem as too hard. When I'm ready with EGTB probing in Chest I will try again, it should make a big difference, here. Heiner
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