Author: Heiner Marxen
Date: 14:17:35 12/30/02
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On December 30, 2002 at 15:41:49, Dieter Buerssner wrote: >On December 30, 2002 at 15:08:22, Heiner Marxen wrote: > >>>>>>>>>b2r2kr/p1pqb1p1/1p5p/4p3/2P1N1P1/1P2Q3/P3P2P/4KRR1 b - - 0 1 > >>>>>>>Perhaps Chest can prove a mate after >>>>>>> >>>>>>>1...Bh4+ 2. Rg3 Qd1+ 3. Kf2 Rf8+ 4. Qf3 Qd4+ 5. Kg2 >>>>>>> >>>>>>>(After 5. Ke1 it is mate in 10 or faster, so this should also be possible?) >>Your analysis matches the output of Chest. Here is its PV >> >>PV: Bxe4 c5 h5 h3 Bxf3+ Rfxf3 Bxg3 Rxf8+ Kxf8 Kxg3 Qf4+ Kg2 hxg4 h4 Rxh4 e3 Rh2+ >>Kg1 Qf2# >> >>In the refutation table we have: > >Which I don't understand, yet - but I will read it up ... It is kind of a 2-ply deep tree that Chest explored, and what it found about the resulting positions: >>refu 19: Bxe4 c5 [ 8-] >>solu 1: Qxe4 [ 7+] ^^---- success for subjob +----- depth of subtree analysis Spelled out: There is a refutation after Bxe4, namely c5, after which there is no mate-in-8. But there is also a solution, when Bxe4 is followed by Qxe4, then there does exist a mate-in-7. etc Cheers, Heiner
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