Author: Heiner Marxen
Date: 01:22:14 12/07/02
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On December 06, 2002 at 12:05:09, John Merlino wrote: >On December 06, 2002 at 11:14:09, Art Basham wrote: > >>Sorry......I forgot the black Bishop at c8...:-) >> >>[D]2b2k2/1pp2ppp/5n2/3r4/r6Q/5P2/q5PP/1RB1RB1K w - - > >CM9000, on a P3-733, announces Mate in 12 after 12 seconds. Then, after 30 >seconds, it announces Mate in 10. I think that is probably the optimal mate. > >Time Depth Score Positions Moves >0:00 1/3 5.53 5373 1.Qxf6 Be6 2.Rxe6 Rd7 >0:00 1/4 11.14 52217 1.Qxf6 Re4 2.Rxe4 Be6 3.Rxe6 Rd7 >0:01 1/5 12.61 124498 1.Qxf6 Be6 2.Rxe6 h5 3.Qe7+ Kg8 > 4.Qe8+ Kh7 5.Qxf7 Rf4 6.Bxf4 >0:07 1/6 20.43 610802 1.Qxf6 h5 2.Bh6 Rg4 3.fxg4 Be6 > 4.Rxe6 Qxg2+ 5.Bxg2 >0:12 1/7 Mate12 1202033 1.Qxf6 Be6 2.Rxe6 Qxg2+ 3.Kxg2 > Ra2+ 4.Kg1 h6 5.Bxh6 Rg5+ 6.Qxg5 > Rg2+ 7.Kxg2 fxe6 8.Qxg7+ Ke8 9.Qf8+ > Kd7 10.Bb5+ c6 11.Rd1+ Kc7 12.Qd8# >0:14 1/8 Mate12 1563220 1.Qxf6 Qxg2+ 2.Kxg2 Ra2+ 3.Kg1 > h5 4.Bh6 Re2 5.Rxe2 Be6 6.Rxe6 > Rg5+ 7.Qxg5 fxe6 8.Qxg7+ Ke8 9.Qf8+ > Kd7 10.Bb5+ c6 11.Rd1+ Kc7 12.Qd8# >0:19 1/9 Mate12 2174126 1.Qxf6 Qxg2+ 2.Kxg2 Ra2+ 3.Kg1 > h6 4.Bxh6 Re2 5.Rxe2 Be6 6.Rxe6 > Rg5+ 7.Qxg5 fxe6 8.Qxg7+ Ke8 9.Qf8+ > Kd7 10.Bb5+ c6 11.Rd1+ Kc7 12.Qd8# >0:30 1/10 Mate10 3504349 1.Qxf6 Qxg2+ 2.Bxg2 Re4 3.Rxe4 > Rd1+ 4.Bf1 Rxf1+ 5.Kg2 Bh3+ 6.Kg3 > Rg1+ 7.Kxh3 gxf6 8.Bh6+ Rg7 9.Rbe1 > Kg8 10.Re8# >0:46 2/11 Mate10 5509394 1.Qxf6 Qxg2+ 2.Bxg2 Re4 3.Rxe4 > Rd1+ 4.Bf1 Rxf1+ 5.Kg2 Bh3+ 6.Kg3 > Rg1+ 7.Kxh3 gxf6 8.Bh6+ Rg7 9.Rbe1 > Kg8 10.Re8# >1:32 3/12 Mate10 11597206 1.Qxf6 Qxg2+ 2.Bxg2 Re4 3.Rxe4 > Rd1+ 4.Bf1 Rxf1+ 5.Kg2 Bh3+ 6.Kg3 > Rg1+ 7.Kxh3 gxf6 8.Bh6+ Rg7 9.Rbe1 > Kg8 10.Re8# > >jm Well done! After just 2.8 hours (;-) Chest confirms this to be the shortest possible mate, and Qxf6 to be the only key move (Athlon 1500+, 128 MB hash): PV: Qxf6 Qxg2+ Bxg2 Be6 Rxe6 Rd1+ Bf1 Rxf1+ Kg2 Rf2+ Kxf2 Ra2+ Kf1 Rf2+ Kxf2 gxf6 Bh6+ Kg8 Re8# Towards the end the EBF raised up to nearly 20: # 4 0.02s [ 2.00] 4kN [ 8.49] 1.06 450- 0 # 5 0.20s [ 10.00] 24kN [ 5.77] 1.29 3655- 0 # 6 1.25s [ 6.25] 156kN [ 6.43] 1.68 23993- 0 # 7 8.10s [ 6.48] 1148kN [ 7.35] 1.82 167735- 0 # 8 47.44s [ 5.86] 7326kN [ 6.38] 2.14 942051- 129 # 9 547.67s [ 11.54] 92757kN [ 12.66] 2.14 9642964- 6443747 # 10 9932.39s [ 18.14] 1814365kN [ 19.56] 2.38 160602425- 157403192 Cheers, Heiner
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