Author: Fernando Alonso
Date: 23:53:27 05/28/03
Go up one level in this thread
On May 28, 2003 at 17:28:46, John Merlino wrote: >This position is one that was posted many months ago, in which several programs >were able to find Rxh5, and a couple of them were able to announce mate (in 12 >moves or so). CM9000, however, found Qxf4! in less than 20 seconds on a P3-750, >and announced Mate in 10. > >[D]4r1k1/qp1r1p2/2pb1Bp1/p6p/2PP1n1R/1P3P2/P4P2/2Q2K1R w > >Time Depth Score Positions Moves >0:00 1/3 -1.80 2438 1.Rxf4 Bxf4 2.Qxf4 Re6 3.Be5 b6 >0:00 1/4 -1.26 7609 1.Rxf4 Bxf4 2.Qxf4 Re6 3.Be5 Kh7 > 4.Qg5 >0:00 1/5 -1.26 24204 1.Rxf4 Bxf4 2.Qxf4 Re6 3.Be5 Kh7 > 4.Qg5 >0:01 1/6 -1.43 107926 1.Rxf4 Re6 2.Rf5 Rxf6 3.Rxf6 Qxd4 > 4.Qg5 Be5 >0:01 1/6 1.34 140417 1.Rxh5 gxh5 2.Qxf4 Re1+ 3.Kxe1 > Re7+ 4.Be5 Bxe5 5.Qg5+ Kf8 6.dxe5 >0:02 1/7 2.28 201244 1.Rxh5 gxh5 2.Qxf4 Re1+ 3.Kxe1 > Re7+ 4.Be5 Bxe5 5.dxe5 Rd7 6.Qg5+ > Kf8 7.Rxh5 >0:07 1/8 9.09 709292 1.Rxh5 gxh5 2.Qxf4 Re1+ 3.Kxe1 > Re7+ 4.Kf1 Re1+ 5.Kxe1 Bb4+ 6.Kf1 > Kf8 7.Rxh5 >0:11 1/8 13.43 1045981 1.Qxf4 Re1+ 2.Kxe1 Bxf4 3.Rxh5 > Re7+ 4.Kf1 Re1+ 5.Kxe1 Bd2+ 6.Kxd2 > gxh5 7.Rxh5 Qxd4+ 8.Bxd4 Kf8 9.Rxa5 > Ke7 >0:19 1/9 Mate10 1996510 1.Qxf4 Re1+ 2.Kg2 Rg1+ 3.Kxg1 Qc5 > 4.Rxh5 gxh5 5.Qh6 Qg5+ 6.Qxg5+ > Kf8 7.Qg8+ Kxg8 8.Rxh5 Bh2+ 9.Rxh2 > Kf8 10.Rh8# >0:19 1/10 Mate10 2090834 1.Qxf4 Re1+ 2.Kg2 Rg1+ 3.Kxg1 Qc5 > 4.Rxh5 gxh5 5.Qh6 Qg5+ 6.Qxg5+ > Kf8 7.Qg8+ Kxg8 8.Rxh5 Bh2+ 9.Rxh2 > Kf8 10.Rh8# >0:21 2/11 Mate10 2337348 1.Qxf4 Re1+ 2.Kg2 Rg1+ 3.Kxg1 Qc5 > 4.Rxh5 gxh5 5.Qh6 Qg5+ 6.Qxg5+ > Kf8 7.Qg8+ Kxg8 8.Rxh5 Bh2+ 9.Rxh2 > Kf8 10.Rh8# > >So, just for fun, I wondered what the situation would be if it were Black to >move in this position. > >[D]4r1k1/qp1r1p2/2pb1Bp1/p6p/2PP1n1R/1P3P2/P4P2/2Q2K1R b > >And I discovered that, at least for The King, finding the relatively obvious (at >least for a patzer like me) move Re6 is much more difficult than I thought it >would be. Instead, The King plays with odd moves like Rde7(??), causing a big >fail low that takes almost three minutes to finally resolve to Re6 on a P3-750. > >Time Depth Score Positions Moves >0:00 1/3 -3.66 1522 1...Qb8 2.Bg5 Nd3 3.Qd2 >0:00 1/4 -3.88 5172 1...Qb8 2.Bg5 Nd3 3.Qd2 Re1+ 4.Kg2 >0:00 1/5 -3.70 20612 1...Qb8 2.Rxh5 gxh5 3.Rxh5 Re1+ > 4.Kxe1 Qe8+ 5.Kf1 Qe2+ 6.Kg1 Nxh5 > 7.Qg5+ Kf8 8.Qxh5 >0:00 1/6 -3.70 77068 1...Qb8 2.Rxh5 gxh5 3.Rxh5 Re1+ > 4.Kxe1 Qe8+ 5.Kf1 Qe2+ 6.Kg1 Nxh5 > 7.Qg5+ Kf8 8.Qxh5 >0:02 1/7 1.06 201524 1...Qb8 2.Qxf4 Bxf4 3.Rxh5 gxh5 > 4.Rxh5 Re1+ 5.Kxe1 Re7+ 6.Kf1 Re1+ > 7.Kxe1 Bd2+ 8.Kf1 Bh6 9.Rxh6 >0:08 1/7 0.85 720744 1...a4 2.Qxf4 Bxf4 3.Rxh5 gxh5 > 4.Rxh5 Re1+ 5.Kxe1 Re7+ 6.Kf1 Re1+ > 7.Kxe1 Bh6 8.Rxh6 Qa5+ 9.Kf1 >0:09 1/7 -2.38 777717 1...Rde7 2.Bxe7 Qxd4 3.Rxf4 Bxf4 > 4.Qe1 b5 >0:12 1/8 -2.86 1048763 1...Rde7 2.Bxe7 Qxd4 3.Rxf4 Bxf4 > 4.Qa3 Qe5 5.Bc5 >0:33 1/9 9.90 3020660 1...Rde7 2.Qxf4 Re1+ 3.Kg2 Qxd4 > 4.Qxd4 Rxh1 5.Rxh1 Re6 6.Rd1 b5 >0:38 1/9 4.53 3499540 1...Rdd8 2.Qxf4 Re1+ 3.Kxe1 Re8+ > 4.Be5 Bxe5 5.dxe5 Qc5 6.Kf1 Rxe5 > 7.Qf6 >2:39 1/9 -1.30 13758757 1...Re2 2.Rxf4 Re6 3.d5 cxd5 4.cxd5 > Rc7 5.Qb2 Qa6+ 6.Kg2 Bxf4 7.dxe6 > Qxe6 >2:45 1/9 -2.09 14425940 1...Re6 2.Rxf4 Bxf4 3.Qxf4 a4 4.bxa4 > Rxf6 5.Qxf6 Rxd4 6.Rh4 Rd2 7.Rh2 > Qxa4 >2:59 1/10 -1.83 15767820 1...Re6 2.Rxf4 Bxf4 3.Qxf4 Qa8 > 4.Kg2 b6 5.Qg5 Qe8 6.d5 cxd5 7.cxd5 > > >Do any other programs have this "problem"? Is it a "problem" at all, or is it >actually a good test position with Black to move? > >jm CM9000 on a XP1800 32MB hash and experimental settings finds it at ply 9 in 44secs. Nueva partida 4r1k1/qp1r1p2/2pb1Bp1/p6p/2PP1n1R/1P3P2/P4P2/2Q2K1R b - - 0 1 Analysis by CM9000 X: -+ (-3.56) Profundidad: 5 00:00:03 1...Db8 2.Txh5 gxh5 3.Txh5 Te1+ 4.Rxe1 De8+ 5.Rf1 De2+ 6.Rg1 Cxh5 7.Dg5+ Rf8 8.Dxh5 -+ (-3.56) Profundidad: 6 00:00:03 84kN 1...Db8 2.Dxf4 Axf4 3.Txh5 gxh5 4.Txh5 Te1+ 5.Rxe1 Te7+ 6.Rf1 Te1+ 7.Rxe1 Ad2+ 8.Rf1 Ah6 9.Txh6 ± (1.08) Profundidad: 7 00:00:03 229kN 1...Tde7 2.Axe7 Dxd4 3.Txf4 Axf4 4.De1 b5 -+ (-2.52) Profundidad: 7 00:00:05 957kN 1...Tde7 2.Axe7 Dxd4 3.Txf4 Axf4 4.Da3 De5 5.Th4 Txe7 6.Txf4 Dxf4 7.Dxe7 Dxf3 8.Dxb7 -+ (-2.91) Profundidad: 8 00:00:05 1129kN 1...Tde7 2.Dxf4 Te1+ 3.Rg2 Dxd4 4.Dxd4 Txh1 5.Txh1 Te6 6.Td1 b5 +- (9.99) Profundidad: 9 00:00:13 2789kN 1...b5 2.Dxf4 Te1+ 3.Rxe1 Axf4 4.Txh5 gxh5 5.Txh5 Te7+ 6.Rf1 Te1+ 7.Rxe1 De7+ 8.Axe7 Rg7 9.cxb5 Rg6 +- (9.84) Profundidad: 9 00:00:19 4039kN 1...a4 2.Dxf4 Te1+ 3.Rg2 Af8 4.Txe1 Da5 5.Te8 Db4 6.Dh6 +- (6.90) Profundidad: 9 00:00:22 4750kN 1...Tdd8 2.Dxf4 Te1+ 3.Rxe1 Te8+ 4.Ae5 Axe5 5.dxe5 Dc5 6.Rf1 Txe5 7.Df6 +- (4.54) Profundidad: 9 00:00:25 5290kN 1...Te6 2.Txf4 Axf4 3.Dxf4 a4 4.bxa4 Txf6 5.Dxf6 Txd4 6.Th4 Td2 7.Th2 Dxa4 -+ (-2.05) Profundidad: 9 00:00:44 9165kN 1...Te6 2.Txf4 Axf4 3.Dxf4 Da8 4.Dg5 De8 5.Df4 b6 6.Ae5 Df8 7.Dg5 -+ (-2.00) Profundidad: 10 00:00:50 10513kN 1...Te6 2.Txf4 Axf4 3.Dxf4 Txf6 4.Dxf6 Txd4 5.Re2 Dc5 6.Tc1 Td6 7.Df4 g5 8.De4 Te6 -+ (-1.80) Profundidad: 11 00:01:11 15293kN Regards, Fernando.
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