Author: Mike S.
Date: 07:02:39 10/17/00
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On October 17, 2000 at 02:13:56, Uri Blass wrote: >[D]1k1r3r/p1pq1b1p/1pPbpp2/8/Q2P1N2/P3BP2/B5PP/2R3K1 b - - 0 1 >The problem is to find Qc8. Very difficult for programs. This is a good example for the different thinking of man and machine. A human's eye is immediatly focussed to the dangerous square b7. 1...Qc8 [1...Bxf4 2.cxd7 Bxe3+ 3.Kf1 Bxc1 4.Bc4 Bg6 (4...a5 This doesn't defend either. 5.Qc6 Ka7 6.Qxc7+ Ka8 7.Bb5 Rc8 8.Bc6#) 5.Ba6!+- (5.Qc6 Rxd7 6.Ba6 Bd3+ 7.Bxd3 Rd6 8.Qxc1 Rxd4+-) ] 2.Nd3! I can't find a convincing black defence. I've tested some engines under CB 7.0 for about 2 minues each (K6-2/400, 8 MB Hash). Most of them would have played 1...Bxf4, with the following evaluations: Crafty 17.04: -3.42 Fritz 5.32: -0.75 Hiarcs 7.32: +0.34 Junior 5: -2.93 (0.00 after 3:53) Successful was: Fritz 6 light: Qc8 -0.31 after 1:28 Regards, M.Scheidl
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