Author: Heiner Marxen
Date: 05:23:51 02/11/00
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On February 11, 2000 at 01:09:50, Dann Corbit wrote: >On February 11, 2000 at 01:02:25, Jeremiah Penery wrote: >>On February 10, 2000 at 19:48:08, Dann Corbit wrote: >[snip] >>>Chest. Took quite a while, but the machine was busy doing stuff. >>> >>>E:\crafty\Release>chest319 -b -z 11 epd.epd >>>6n1/qp2b3/1p4K1/p4N2/2B2k1p/4pP2/4p2P/4N3 w - - acn 403261928; acs 15956; bm >>>Nd4; ce 32746; dm 11; pv Nd4 Ke5 Nb5 Kf4 Bd5 Ke5 Bxg8 Kf4 Bd5 Ke5 Bc4 Kf4 Nd4 >>>Ke5 Nf5 Kf4 h3 b5 Nd3+ Kxf3 Bd5#; >> >>My modified Crafty 17.7 finds this in just over 11 minutes (on a semi-busy >>machine): >> >>16 11:14 Mat11 1. Nd4 Ke5 2. Nb5 Kf4 3. Bd5 Ke5 4. >> Bxg8 Kf4 5. Bd5 Ke5 6. Bc4 Kf4 7. Nd4 >> Ke5 8. Nf5 Kf4 9. h3 Ba3 10. Nd3+ Kxf3 >> 11. Bd5# > >That's pretty amazing. Do you have a complete list of the modifications that >you make? > >Do you know a reason why it finds the mate so fast? Before 9.h3 white always threatens a mate in one: Nd3# Therefore, the solution line is pretty forced. I suspect that helps normal (playing) programs to find it. BTW, the solution shown in the PV above is unique, i.e. no other key moves and no duals. Heiner
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