Author: Paul
Date: 05:31:57 09/28/01
Go up one level in this thread
On September 28, 2001 at 05:16:30, Heiner Marxen wrote: >On September 27, 2001 at 16:09:10, Paul wrote: > >>On September 27, 2001 at 15:14:39, leonid wrote: >> >>>Hi! >>> >>>The next position is easily solvable for white and for black side. Even if you >>>will look for solution by brute force it could not very slow. >>> >>>2rqqr2/R1q2k1B/1B1qn1N1/p1Q2N1p/Qb1RR1qQ/1Kp2nQ1/2QpbP2/3QN3 w - - >>> >>>Please indicate your result. >>> >>>Thanks, >>>Leonid. >> >>Hi Leonid! >> >>Pretz says White mates in 9, it takes longer than I thought on my 1GHz P3 >>though, a full 16 seconds: >> >>00:16 WM9 06 Nh8+ Rxh8 Nxd6+ Kg7 Rxg4+ Neg5 Rxg5+ Nxg5 Qcxg5+ Qxg5 Qhxg5+ Qg6 >>Qgxg6+ Kf8 Qae8+ Rxe8 Qxe8# > >Hi Leonid, Hi Paul! > >Here the confirmations from Chest (on K7/600 with 350 MB hash)... >With white to move there are 3 solutions in 9 moves (4.2 hours): > >PV: Nh8+ Rxh8 Nxd6+ Kg7 Nxe8+ Rxe8 Qge5+ Nxe5 Qxe5+ Kh6 Qhf6+ Qxf6 Qxf6+ Kxh7 >Rxg4+ Bd3 Qxd3# >PV: Rxc7+ Rxc7 Nh8+ Rxh8 Nxd6+ Qxd6 Rf4+ Nxf4 Rxf4+ Kg7 Qgxg4+ Ng5 Qhxg5+ Qdg6 >Qgxg6+ Qxg6 Qgxg6# >PV: Qxe8+ Rxe8 Nh8+ Rxh8 Nxd6+ Qxd6 Rf4+ Nxf4 Rxf4+ Qf5 Rxf5+ Qf6 Rxf6+ Ke8 Bg6+ >Qf7+ Bxf7# > > >>With Black it's a lot easier, a mate in 8 in 1 second: >> >>00:01 BM8 08 Qxa4+ Kxa4 Nxc5+ Bxc5 Bb5+ Kxb5 Nxd4+ Nxd4 Qxc5+ Ka4 Qdd7+ Nb5 >>Qcxb5+ Kb3 Qa4# > >Yes, it is easier, and the above move is the only solution (21.08 sec): > >PV: Qxa4+ Kxa4 Nxc5+ Bxc5 Bb5+ Kxb5 Nxd4+ Nxd4 Qxc5+ Ka4 Qgd7+ Nb5 Qcxb5+ Kb3 >Qa4# > >Cheers, >Heiner Hi Heiner! I'm happy to see we still agree (sometimes :). The mate in 9 one wasn't very easy now was it? 4.2 hours ... Anyway, have a faster processor now and more memory (512MB), so that's one ply deeper in the same amount of time, not that it's ever going to be enough for some of Leonid's problems! Hope you have a nice time at the Berlin tourney, wish I could be there ... Grüße, Paul
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