Author: leonid
Date: 18:54:52 07/13/02
Go up one level in this thread
On July 13, 2002 at 18:57:43, John Merlino wrote: >On July 12, 2002 at 22:43:40, leonid wrote: > >>Hi, >> >>This one should be not difficult: >> >>[D]r2kq2r/1R1NN1R1/qqqqqqqq/8/Q1QQQQ1Q/2P2Q2/B2nnP1B/2bK1b2 w - - >> >>If You will find that it take time to solve it, then try for black side. There >>mate is two moves shorter and is very easy. >> >>Please indicate Your result. >> >>Thanks, >>Leonid. > >Chessmaster 9000, on a PIII-600, does not announce a mate in less than 30 >minutes: > >Time Depth Score Positions Moves >0:04 1/3 0.87 209120 1.Nxc6+ Qbxc6 2.Qaxc6 Qhxf4 3.Qc7+ > Qxc7 4.Qxc7+ Qxc7 5.Bxc7+ Kc8 6.Qdxf6 >3:02 1/4 7.41 9242935 1.Nxc6+ Qbxc6 2.Qcxc6 Nxc3+ 3.Qfxc3 > Qe2+ 4.Kxc1 Qe1+ 5.Kb2 Qxa2+ 6.Qxa2 > Rxa2+ 7.Kxa2 >25:11 1/5 14.82 83830444 1.Nxc6+ Qbxc6 2.Qaxa6 Nxc3+ 3.Qcxc3 > Be2+ 4.Qfxe2 Qg1+ 5.Bxg1 Qxc3 6.Nxf6 I am not sure at what depth Chess Master found mate for white side but our time and computers are almost identical. Mine found shortest mate in 10 moves, in 24 min. and 55 sec., by brute force. My computer is Celeron 600Mhz. No hash. Mine default selective was not able to find mate at 10 moves depth and reached it only in 12 moves. >But, as requested, here's the result for Black to move (19 seconds to announce >Mate in 9, and 26 seconds to announce Mate in 8): > >Time Depth Score Positions Moves >0:04 1/3 -35.68 176480 1...Qaxa4+ 2.Bb3 Qaxb3+ 3.Qxb3 > Qexb3+ 4.Ke1 Nxf3+ 5.Qfxf3 Qcxc3+ > 6.Qfxc3 Qxc3+ 7.Qxc3 Nxc3 >0:06 1/3 -44.51 307550 1...Qcxa4+ 2.Bb3 Qaxb3+ 3.Qxb3 > Qexb3+ 4.Ke1 Nxf3+ 5.Qfxf3 Nxd4 >0:14 1/4 -43.70 709323 1...Qcxa4+ 2.Bb3 Qaxb3+ 3.Qxb3 > Qexb3+ 4.Ke1 Nxf3+ 5.Qexf3 Nxf4 >0:19 1/4 -Mate09 975535 1...Qaxa4+ 2.Bb3 Qaxb3+ 3.Qxb3 > Qexb3+ 4.Ke1 Nxf3+ 5.Qexf3 Bd2+ > 6.Qfxd2 Qxd2+ 7.Qxd2 Qxd2+ 8.Kxd2 > Qcxc3+ 9.Qxc3 Qfxc3# >0:26 1/5 -Mate08 1255683 1...Qaxa4+ 2.Bb3 Qaxb3+ 3.Qxb3 > Qexb3+ 4.Ke1 Nxf3+ 5.Qexf3 Bd2+ > 6.Qfxd2 Qgb1+ 7.Qd1 Q1xd1+ 8.Qxd1 > Qbxd1# >0:35 1/6 -Mate08 1665907 1...Qaxa4+ 2.Bb3 Qaxb3+ 3.Qxb3 > Qexb3+ 4.Ke1 Nxf3+ 5.Qexf3 Bd2+ > 6.Qfxd2 Qgb1+ 7.Qd1 Q1xd1+ 8.Qxd1 > Qbxd1# For black side we have almost identical time for identical hardware. Mine found mate (LLchess mate solver) at shortest depth, 8 moves by brute force, in 25 sec. As I see after description of this position, my program was not able to find any mate by selective at 8 moves. It found mate only at 11 moves depth. If Chess Master found mate by selective in 8, then it selective do much better. Leonid. >jm
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