Author: Heiner Marxen
Date: 06:43:51 08/08/01
Go up one level in this thread
On August 03, 2001 at 11:12:00, Angrim wrote: >On August 02, 2001 at 17:30:17, leonid wrote: > >>Hi! >> >>If you are ready for solving one mate, look into this: >> >>[D]5QRq/4BBqr/3QNqnq/1KQQqbbk/3QNqn1/4QQqr/5QRq/6Qq w - - >> >>Please indicate your result. >> >>Thanks, >>Leonid. > >proved that move e6xf4 wins, 13 turns >PN2:23839139 evals, 635533 expands, 138.93 seconds > >Interestingly, more than 95% of the search time was spent searching the >correct move. e4xf6 got another 4% or so, and might also be winning. > >Angrim Hello Leonid & Angrim! Since I were away for a week, I also try the older problems, like this one... The move 1.Nxf4+ that Angrim's program finds, in fact (i.e. according to Chest) is a mate in 8! As are 1.Nxg3+ and 1.Q6xe5. Here are Chest's PVs: PV: Nxf4+ Qexf4 Nxf6+ Qxf6 Qxh6+ Rxh6 Qexf4 Bd3+ Ka5 Bf5 Q3xg4+ Qxg4 Qxg4+ Bxg4 Qxg4# PV: Nxg3+ Qfxg3 Qdxg4+ Bxg4 Q6xe5 Qf5 Qfxf5 Bxf5 Qef3+ Qg4 Qxg4+ Bxg4 Qxg5+ Qxg5 Qxg5# PV: Q6xe5 Rh4 Nxg3+ Qfxg3 Qfxg4+ Qxg4 Qxg4+ Rxg4 Rxh2+ Rh4 Nf4+ Bxf4 Qfe2+ Qf3 Q2xf3# OTOH, this mate in 8 was quite expensive to calculate: on my K7/600 with 350 MB hash it needed 13.7 hours. Due to some near solutions the EBF increased in the last depth, while it was already above 10: depth time EBF[T] EBF[N] # 1 0.00s 0kN 0.87 1- 0 # 2 0.00s 0kN 1.00 1- 0 # 3 0.08s 6kN [ 34.99] 0.99 98- 0 # 4 1.80s [ 22.50] 100kN [ 17.61] 1.09 4962- 0 # 5 21.14s [ 11.74] 1115kN [ 11.10] 1.26 79456- 0 # 6 214.72s [ 10.16] 11202kN [ 10.05] 1.53 881887- 0 # 7 2543.97s [ 11.85] 134530kN [ 12.01] 1.75 10253761- 1921374 # 8 49368.95s [ 19.41] 2683852kN [ 19.95] 1.68 192280810- 183532909 Chest's "refutation table" reveals some of the effort it had to spend for non-solution moves like Qxg7: refu 1: Nxf4+ Qexf4 [ 6-] solu 21: Qexf4 [ 7+] solu 22: Qgxf4 [ 7+] solu 23: Bxf4 [ 7+] solu 24: Kh4 [ 3+] refu 2: Nxg7+ Rxg7 [ 7-] refu 3: Nxf6+ Qgxf6 [ 7-] solu 6: Qexf6 [ 6+] refu 4: Nxg3+ Rxg3 [ 6-] solu 25: Rxg3 [ 7+] solu 26: Qfxg3 [ 7+] solu 27: Qhxg3 [ 7+] solu 28: Kh4 [ 3+] refu 5: Bxg6+ Qgxg6 [ 7-] solu 29: Bxg6 [ 7+] refu 6: Qxg4+ Bxg4 [ 7-] refu 7: Nc7 Bd7+ [ 7-] refu 8: Nd8 Bd7+ [ 7-] refu 9: N6xg5 Bd7+ [ 7-] refu 10: Nc3 Bd3+ [ 7-] refu 11: Nd2 Bd3+ [ 7-] refu 12: N4xg5 Bd3+ [ 7-] refu 13: Be8 Qfxe4 [ 7-] refu 14: Bxf6 Qfxf3 [ 7-] solu 30: Qfxe4 [ 7+] solu 31: Qxe6 [ 7+] solu 32: Qexe4 [ 7+] refu 15: Bd8 Qfxe4 [ 7-] refu 16: Rxh8 Qfxe4 [ 7-] refu 17: Rxg7 Qfxe4 [ 7-] refu 18: Rxh2 Qgxf3 [ 7-] solu 33: Qfxe4 [ 7+] solu 34: Qfxe6 [ 7+] solu 35: Qexe6 [ 5+] solu 36: Qexe4 [ 6+] refu 19: Rxg3 Qfxf3 [ 7-] solu 3: Qfxe6 [ 4+] solu 4: Qexe6 [ 5+] solu 7: Qfxe4 [ 6+] solu 8: Qexe4 [ 5+] refu 20: Qxh1 Qfxf3 [ 7-] solu 37: Qfxe4 [ 7+] solu 38: Qfxe6 [ 7+] solu 39: Qexe6 [ 6+] solu 40: Qexe4 [ 7+] refu 21: Qgf1 Qxf1+ [ 7-] refu 22: Qge1 Qf1+ [ 7-] refu 23: Qgd1 Qf1+ [ 7-] refu 24: Qgc1 Qf1+ [ 7-] refu 25: Qb1 Qxb1+ [ 7-] refu 26: Qga1 Qb1+ [ 7-] refu 27: Qxh2 Qb1+ [ 7-] refu 28: Qe8 Qfxe4 [ 7-] refu 29: Qfd8 Qfxe4 [ 7-] refu 30: Qfc8 Qfxe6 [ 7-] refu 31: Qfb8 Qfxe6 [ 7-] refu 32: Qfa8 Qfxe6 [ 7-] refu 33: Qxg7 Qxe3 [ 7-] solu 41: Qfxe4 [ 7+] solu 42: Qfxe6 [ 7+] solu 43: Qexe6 [ 7+] solu 44: Qexe4 [ 6+] solu 45: Qfxf3 [ 7+] solu 46: Qxd5 [ 6+] solu 47: Q2xg1 [ 6+] solu 48: Q2xg2 [ 7+] solu 49: Qgxg2 [ 7+] solu 50: Qxd4 [ 6+] solu 51: Qxd6 [ 5+] solu 52: Bxe4 [ 6+] solu 53: Bxe6 [ 6+] refu 34: Q3xg3 Qhxg3 [ 7-] solu 54: Qfxe6 [ 7+] solu 55: Qexe6 [ 6+] solu 56: Qfxe4 [ 7+] solu 57: Qexe4 [ 6+] solu 58: Qfxf7 [ 7+] solu 59: Qxd5 [ 6+] solu 60: Q2xg1 [ 5+] solu 61: Q2xg2 [ 7+] solu 62: Qxd4 [ 2+] solu 63: Qxd6 [ 6+] solu 64: Bxe6 [ 7+] solu 65: Bxe4 [ 5+] solu 66: Qxe3 [ 3+] solu 67: Qxe7 [ 7+] solu 68: Qxf2 [ 3+] solu 69: Qxf8 [ 7+] solu 70: Qgxf7 [ 7+] solu 71: Q1xg1 [ 5+] solu 72: Qf3 [ 6+] solu 73: Q1xg2 [ 7+] solu 74: Nxe3 [ 5+] solu 75: Nxf2 [ 5+] solu 76: Rxg3 [ 7+] refu 35: Qfxf4 Qxf8 [ 7-] solu 1: Qfxe6 [ 2+] solu 5: Qexe6 [ 5+] solu 77: Qxe4 [ 7+] solu 78: Qfxf7 [ 2+] solu 79: Qxd5 [ 6+] solu 80: Q2xg1 [ 6+] solu 81: Q2xg2 [ 7+] solu 82: Qgxg2 [ 6+] solu 83: Qxd4 [ 7+] solu 84: Qxd6 [ 5+] solu 85: Bxe4 [ 6+] solu 86: Bxe6 [ 7+] solu 87: Qxe3 [ 3+] solu 88: Qxe7 [ 7+] solu 89: Qxf2 [ 3+] refu 36: Qf3e2 Qfxe3 [ 7-] refu 37: Qfd1 Qfxe3 [ 7-] refu 38: Q2e2 Qfxf3 [ 7-] refu 39: Qfd2 Qfxe4 [ 7-] refu 40: Qfc2 Qfxe4 [ 7-] refu 41: Qfb2 Qfxe4 [ 7-] refu 42: Qfa2 Qfxe4 [ 7-] refu 43: Qff1 Q2xg2 [ 7-] refu 44: Q2xg3 Qxf3 [ 7-] solu 2: Qfxe4 [ 3+] solu 9: Qfxe6 [ 6+] solu 10: Qexe6 [ 6+] solu 11: Qexe4 [ 4+] solu 12: Qfxf7 [ 4+] solu 13: Qxd5 [ 3+] solu 14: Q2xg1 [ 4+] solu 90: Q2xg2 [ 7+] solu 91: Qxd4 [ 2+] solu 92: Qxd6 [ 4+] solu 93: Bxe4 [ 2+] solu 94: Bxe6 [ 4+] solu 95: Qxe3 [ 2+] solu 96: Qxe7 [ 4+] refu 45: Qfe1 Qfxe4 [ 7-] refu 46: Qed3 Qfxe4 [ 7-] refu 47: Qec3 Qfxe6 [ 7-] refu 48: Qeb3 Qfxf3 [ 7-] refu 49: Qea3 Qfxe4 [ 7-] refu 50: Qee2 Qfxf3 [ 7-] refu 51: Qee1 Qfxe4 [ 7-] refu 52: Qexf4 Qxf3 [ 7-] solu 15: Qfxe6 [ 6+] solu 16: Qexe6 [ 6+] solu 17: Qxe4 [ 6+] solu 18: Qfxf7 [ 4+] solu 19: Qxd5 [ 4+] solu 20: Q2xg1 [ 4+] solu 97: Q2xg2 [ 7+] solu 98: Qgxg2 [ 4+] solu 99: Qxd4 [ 7+] solu 100: Qxd6 [ 4+] solu 101: Bxe4 [ 2+] solu 102: Bxe6 [ 4+] refu 53: Qed2 Qfxe4 [ 7-] refu 54: Qec1 Qfxe4 [ 7-] refu 55: Q6c6 Qb8+ [ 7-] refu 56: Qdb6 Qfxe6 [ 7-] refu 57: Qa6 Qb8+ [ 7-] refu 58: Qd7 Qb8+ [ 7-] refu 59: Qdd8 Qb8+ [ 7-] refu 60: Q6xe5 Qxe6 [ 6-] solu 103: Qxe6 [ 7+] solu 104: Qxe4 [ 7+] solu 105: Qfxf3 [ 7+] solu 106: Qfxf7 [ 7+] solu 107: Q2xg1 [ 5+] solu 108: Qxe7 [ 6+] solu 109: Q2xg2 [ 7+] solu 110: Qgxg2 [ 7+] solu 111: Bxe4 [ 4+] solu 112: Bxe6 [ 4+] solu 113: Qxe3 [ 6+] solu 114: Qgxf3 [ 7+] solu 115: Qxf2 [ 6+] solu 116: Qxf8 [ 6+] solu 117: Qgxf7 [ 7+] solu 118: Q1xg1 [ 5+] solu 119: Q1xg2 [ 7+] solu 120: Q4xe5 [ 7+] solu 121: Q6xe5 [ 7+] solu 122: Rh4 [ 7+] solu 123: Qh4 [ 6+] solu 124: Qhxg8 [ 6+] solu 125: Qgxg8 [ 6+] solu 126: Bh4 [ 5+] solu 127: Kh4 [ 6+] refu 61: Qdc7 Qfxe6 [ 7-] refu 62: Qdb8 Qxb8+ [ 7-] refu 63: Q5xe5 Qfxf3 [ 7-] solu 128: Q6xe5 [ 7+] solu 129: Qxe4 [ 6+] solu 130: Qxe6 [ 7+] refu 64: Qd5c4 Qfxe4 [ 7-] refu 65: Qdb3 Qfxe4 [ 7-] refu 66: Qda2 Qfxe4 [ 7-] refu 67: Qd5c6 Qfxe4 [ 7-] refu 68: Qb7 Qfxe4 [ 7-] refu 69: Qda8 Qxc5+ [ 7-] refu 70: Q4c4 Qb2+ [ 7-] refu 71: Qdb4 Qfxe4 [ 7-] refu 72: Qa4 Qb2+ [ 7-] refu 73: Qdd3 Qb2+ [ 7-] refu 74: Qdd2 Qb2+ [ 7-] refu 75: Qdd1 Qb2+ [ 7-] refu 76: Q4xe5 Qxe3 [ 7-] solu 131: Qxe4 [ 7+] solu 132: Qxe6 [ 7+] solu 133: Qfxf3 [ 7+] solu 134: Qfxf7 [ 7+] refu 77: Qdc3 Qfxe4 [ 7-] refu 78: Qdb2 Qxb2+ [ 7-] refu 79: Qda1 Qb2+ [ 7-] refu 80: Qcc6 Qxd5+ [ 7-] refu 81: Qcc7 Qxd5+ [ 7-] refu 82: Qcc8 Qxd5+ [ 7-] refu 83: Qcc4 Qxd5+ [ 7-] refu 84: Qcc3 Qxd5+ [ 7-] refu 85: Qcc2 Qxd5+ [ 7-] refu 86: Qcc1 Qxd5+ [ 7-] refu 87: Qcb4 Qxd5+ [ 7-] refu 88: Qca3 Qxd5+ [ 7-] refu 89: Qcb6 Qxd5+ [ 7-] refu 90: Qa7 Qxd5+ [ 7-] refu 91: Ka5 Qxd6 [ 7-] refu 92: Kb6 Qxd6+ [ 7-] refu 93: Kb4 Qxd4+ [ 7-] refu 94: Kc6 Qxd6+ [ 7-] refu 95: Ka4 Qfxe4 [ 7-] refu 96: Kc4 Qfxe4 [ 7-] refu 97: Ka6 Qxd6+ [ 7-] Cheers, Heiner
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