Author: Uri Blass
Date: 23:29:51 04/03/03
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On April 04, 2003 at 01:08:05, Anthony Cozzie wrote: >On April 03, 2003 at 17:35:16, George Tsavdaris wrote: > >>Is there any engine can find the right move in this incredible position >>in a reasonable time? All the engines i tried on my 1500 MHz PC failed. >>Even Fritz 8 after 20 minutes didn't find the move. >> >>The amazing move is 1.Bc7!! After that 1...Qxc8 is forced. 1...Qxc8 >>2.gxf7+ Kh8 [2...Kf8 3.Bd6#] >>3.Be5 Qc5 The only move. >>4.Bb2! Nc7 Again the only move. >>5.Ba1 a4 6.Bb2 a3 7.Ba1 a2 8.Bb2 a1Q 9.Bxa1 And black has no other moves! 1-0 >> >>[D]n1QBq1k1/5p1p/5KP1/p7/8/8/8/8 w - - 0 1 > >A *very* tough position! > >Root: >1. gxh7 Kh8 2. Qxa8 a4 3. Qd5 Qf8 4. Ke5 Kxh7 5. Qd3 Kg8 6. Bf6 Qb8 7. Kf5 Qc8 >8. Kf4 Qc1 9. Kg3 > = (2.68) Depth: 14 00:32:59.84 752994kN > >After forcing Bc7 Qxc8: >1. gxf7 Kh8 2. Be5 Qc5 3. Bb2 Nc7 4. Ba1 a4 5. Bb2 a3 6. Ba1 a2 7. Bb2 a1=Q 8. >Bxa1 Nb5 9. Ke6 Nc3 10. Bxc3 Qxc3 11. f8=Q > = MAT10 Depth: 16 00:04:50.02 107802kN > >So it looks like this position would require an 18 ply search, or ~10 hours for >Zappa (AMD 1.5GHZ) > >anthony No It looks like this position is never going to be solved by a lot of programs because of a null move problem. After the first move it is possible to see it because the score is bad in any case so there are less moves with no threat to prune. Uri
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