Author: Heiner Marxen
Date: 15:44:22 06/10/01
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On June 10, 2001 at 10:31:06, leonid wrote: >Hi! > >Was today very uncertain what position to indicate here. Hello Leonid! You are invited to show us whatever you come up with! If we can't cope with it... that isn't your problem, or is it? :-) > I have one that I like >but it look very deep. Other is too easy. Finally decided to put here one >extremely easy and the second that look to be moderated in complexity. You are >invited to solve only one of them, after your like, or just both. > >[D]rnNR1bk1/pRQb1q2/P2pNr1n/3PpBpN/4P1Pp/5P1P/7K/8 w - - This one appears to be a mate in 7 with two key moves: PV: Nxf8 Nxg4+ Bxg4 Be8 Nxf6+ Qxf6 Be6+ Qf7 Qxf7+ Bxf7 Rxf7 g4 Nd7# PV: Qxd6 Nxg4+ Bxg4 Rg6 Rxf8+ Kh7 Nxg5+ Rxg5 Rxf7+ Rg7 Rxg7+ Kh8 Qf8# (203 seconds) >[D]1q1k1q2/NnrqrnN1/Q1QbQ1Q1/BqRbRBq1/1q4q1/1q1Q2q1/Q1Q1Q1Q1/3K4 w - - Although this one is deeper (10 moves), it is not that much harder to do for Chest, since here black has some counter resources, which cuts down the effective branching factor (EBF) down to around 5 (the first had EBF ~ 12): PV: Qxc7+ Qdxc7 Qexd6+ Nbxd6 Qgxd6+ Nxd6 Qxd6+ Qd7 Bxc7+ Qxc7 Qxc7+ Qxc7 Rexd5+ Qgd6 Rxd6+ Rd7 Rxd7+ Qxd7 Rc8# (12 minutes) >Please indicate your result. > >Try not forget to name your program and even indicate its site on Web. Never >mind that you think that everybody already knows this. Some people maybe hear >about it for the first time and would like to try it on the spot. Computed with Chest on an AMD K7/600 with 350 MB hash. Chest home page: http://www.drb.insel.de/~heiner/Chess/chest.html Cheers, Heiner
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