Author: Dann Corbit
Date: 11:21:26 01/31/01
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On January 31, 2001 at 13:59:29, Dann Corbit wrote: >On January 31, 2001 at 13:28:30, leonid wrote: > >>Hi! >> >>If you like to solve forced mate, here is the position. >> >>[D]2Q1N1qq/rQ2NPnP/r3qpqk/1Rb1n1qp/3N1nb1/1q1Q1B1R/2QB4/2R1K2R w - - >> >>Please indicate your result... even if your program failed. > >Don't know if it is the shortest mate, but crafty found a checkmate in 12 >minutes, and guessed the key move right away: > >White(1): epdpfga ep.out epp.out >PFGA: EPD record: 1 > time surplus 0.00 time limit 16:39 (16:39) [easy move] > nss depth time score variation (1) > 1 0.62 8.93 1. hxg8=N+ Kh7 2. Qxg6+ Nxg6+ 3. Nxe6 > Rxe6+ > 1-> 0.71 8.93 1. hxg8=N+ Kh7 2. Qxg6+ Nxg6+ 3. Nxe6 > Rxe6+ > 2 1.22 ++ 1. hxg8=N+!! > 2 6.79 14.84 1. hxg8=N+ Qxg8 2. Nxg8+ Kh7 3. Qxg6+ > Nxg6+ 4. Nxe6 <HT> > 2-> 6.94 14.84 1. hxg8=N+ Qxg8 2. Nxg8+ Kh7 3. Qxg6+ > Nxg6+ 4. Nxe6 <HT> > 3 29.90 -- 1. hxg8=N+ > 3 1:19 14.13 1. hxg8=N+ Qxg8 2. Nxg8+ Kh7 3. Ngxf6+ > Kh8 4. Qdxb3 Qxc8 <HT> > 3-> 1:22 14.13 1. hxg8=N+ Qxg8 2. Nxg8+ Kh7 3. Ngxf6+ > Kh8 4. Qdxb3 Qxc8 <HT> > 4 2:07 -- 1. hxg8=N+ > 4 6:13 13.90 1. hxg8=N+ Qxg8 2. Nxg8+ Kh7 3. Ngxf6+ > Kh6 4. Qxg6+ Nxg6+ 5. Nxe6 Qxe6+ 6. > Qxe6 Rxe6+ 7. Qbe4 Bxf3 8. Rxf3 Rxe4+ > 9. Qxe4 <HT> > 4-> 6:38 13.90 1. hxg8=N+ Qxg8 2. Nxg8+ Kh7 3. Ngxf6+ > Kh6 4. Qxg6+ Nxg6+ 5. Nxe6 Qxe6+ 6. > Qxe6 Rxe6+ 7. Qbe4 Bxf3 8. Rxf3 Rxe4+ > 9. Qxe4 <HT> > 5 6:43 ++ 1. hxg8=N+!! > 5 11:27 26.26 1. hxg8=N+ Qxg8 2. Nxg8+ Kh7 3. Ngxf6+ > Kh6 4. Ng8+ <HT> > 5-> 11:28 26.26 1. hxg8=N+ Qxg8 2. Nxg8+ Kh7 3. Ngxf6+ > Kh6 4. Ng8+ <HT> > 6 11:37 ++ 1. hxg8=N+!! > 6 11:55 Mat12 1. hxg8=N+ Qxg8 2. Nxg8+ Kh7 3. Nexf6+ > Qgxf6 4. Nxf6+ Qxf6 5. Qg8+ Kh6 6. > Qh8+ Kg5 7. Qxg6+ Qxg6 8. Bxf4+ Kxf4 > 9. Qh6+ Qxh6 10. Qd2+ Qe3+ 11. Qxe3+ > Kxe3 12. Qe4# <HT> > 6-> 11:58 Mat12 1. hxg8=N+ Qxg8 2. Nxg8+ Kh7 3. Nexf6+ > Qgxf6 4. Nxf6+ Qxf6 5. Qg8+ Kh6 6. > Qh8+ Kg5 7. Qxg6+ Qxg6 8. Bxf4+ Kxf4 > 9. Qh6+ Qxh6 10. Qd2+ Qe3+ 11. Qxe3+ > Kxe3 12. Qe4# <HT> There is no mate in 9, as verified by Chest in about 8 minutes: E:\crafty\release>chest319 -M 256 -z 9 -b epp.out I'm too lazy to try for z 10 and 11. So for sure it is a checkmate, and there is no mate in 9 and there is a mate in 12. A mate in 10 or 11 is an open question.
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