Author: Heiner Marxen
Date: 16:46:25 01/16/02
Go up one level in this thread
On January 16, 2002 at 18:10:43, Heiner Marxen wrote: >On January 16, 2002 at 10:53:01, José Antônio Fabiano Mendes wrote: > >>On January 16, 2002 at 10:49:44, Vincent Lejeune wrote: >> >>>On January 16, 2002 at 10:45:50, José Antônio Fabiano Mendes wrote: >>> >>>> I saw this position in the CSS Forum [ http://www.computerschach.de/forum/ ], >>>> the stipulation is "White to move and mate in 17",I have no way of knowing >>>> if that is true or not,sorry. JAFM >>> >>>after some analysis with a friend it seems that white move and black mates ! >> It could very well be that,I had not thought of this possibility,most >> likely you are right.Congrats! JAFM > >At least Chest confirms that white cannot mate in 17 moves, here. >(Athlon XP 1500+, 11.3 minutes) > >I've started the reverse job, but I do not yet have any idea how long >it will take. > >Cheers, >Heiner Interestingly, Chest finds that white is lost here: after the next ply there will follow a mate in at most 15 moves. Maximal depth is reached after 3 of the leagl white moves: After 1.Qg6+ PV: Kf8 Qf6+ Ke8 Qe6+ Kd8 Qd6+ Kc8 Qf8+ Kc7 Qf7+ Kb6 Qf6+ Kb5 Qf5+ Bd5 Qd3+ Bc4 Qd7+ Bc6 Qf5+ Bc5 Qxc5+ Kxc5 Kc2 Ba4+ Kb2 Bb4 Kb1 Bec3# After 1.Qe6+ PV: Kf8 Qf6+ Ke8 Qe6+ Kd8 Qd6+ Kc8 Qf8+ Kc7 Qf7+ Kb6 Qf6+ Kb5 Qf5+ Bd5 Qd3+ Bc4 Qd7+ Bc6 Qf5+ Bc5 Qxc5+ Kxc5 Kc2 Ba4+ Kb2 Bb4 Kb1 Bec3# PV: Kg7 Qe7+ Kg6 Qe8+ Kg5 Qg8+ Kh4 Qh8+ Kg3 Qg7+ Kh3 Qh7+ Bh4 Qd7+ Kh2 Kc2 Be4+ Kb2 Rg3 Qb5 Bc1+ Kxc1 Bg5+ Kb2 Rf2+ Qe2 Rxe2+ Ka1 Bf6# PV: Kh7 Qe7+ Kh6 Qe6+ Kh5 Qe8+ Kh4 Qh8+ Kg3 Qg7+ Kh3 Qh7+ Bh4 Qd7+ Kh2 Kc2 Be4+ Kb2 Rg3 Qb5 Bc1+ Kxc1 Bg5+ Kb2 Rf2+ Qe2 Rxe2+ Ka1 Bf6# After 1.Qd8+ PV: Kg7 Qd7+ Kg6 Qe8+ Kg5 Qg8+ Kh4 Qh8+ Kg3 Qg7+ Kh3 Qh7+ Bh4 Qd7+ Kh2 Kc2 Be4+ Kb2 Rg3 Qb5 Bc1+ Kxc1 Bg5+ Kb2 Rf2+ Qe2 Rxe2+ Ka1 Bf6# PV: Kf7 Qd7+ Kf6 Qd6+ Kf5 Qd7+ Ke5 Qe7+ Kd5 Qf7+ Kc5 Qe7+ Kb5 Qe8+ Bc6 Qe5+ Bhd5 Qe2+ Ka5 Qf3 Bxf3+ Kc2 Bfe4+ Kb3 Bcd5+ Kb2 Bd4+ Ka3 Bb4# PV: Kh7 Qd7+ Kh6 Qe6+ Kh5 Qe8+ Kh4 Qh8+ Kg3 Qg7+ Kh3 Qh7+ Bh4 Qd7+ Kh2 Kc2 Be4+ Kb2 Rg3 Qb5 Bc1+ Kxc1 Bg5+ Kb2 Rf2+ Qe2 Rxe2+ Ka1 Bf6# I'm too lazy to cut&paste all the other variants, unless someone explicitly demands them. Done on an Athlon 1500+, 128MB hash, 10MB EGTB-cache (some 5-piece) in 38.2 minutes. Not bad :-) Cheers, Heiner
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