Author: John Merlino
Date: 14:28:46 05/28/03
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
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