Author: Heiner Marxen
Date: 09:39:22 06/09/01
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On June 08, 2001 at 18:21:53, leonid wrote: >Hi! > >If you want to solve this position, it will be easy only if your program is good >in mates. > >[D]1r1qkq1r/Q2nqn1Q/NQ2b1QN/qqQ1bQqq/BQ4QB/q6q/3RQR2/4K3 w - - > >Please indicate your result. > >Cheers, >Leonid. Hello Leonid, Chest finds this one to be a mate in 10: PV: Qxd7+ Qbxd7 Bxd7+ Qdxd7 Qhxf7+ Qfxf7 Qfxf7+ Bxf7 Qxb8+ Qad8 Qxe7+ Qgxe7 Qxd8+ Qdxd8 Rxd8+ Qxd8 Qc6+ Qd7 Nc7# No other move forces a mate in 10. This was done on a K7/600 with 350MB hash, and needed 45 minutes to complete. The effective branching factor (EBF) became better and better this time: depth seconds EBF moves/nodes hash-speed # 3 0.04s 1kN 0.96 107- 0 # 4 0.27s [ 6.75] 12kN 1.03 1158- 0 # 5 2.07s [ 7.67] 91kN 1.20 9021- 0 # 6 14.33s [ 6.92] 632kN 1.40 63459- 0 # 7 60.02s [ 4.19] 2644kN 1.72 286055- 0 # 8 215.44s [ 3.59] 9438kN 2.11 1080774- 2 # 9 952.95s [ 4.42] 41520kN 2.39 4979356- 29851 # 10 2703.48s [ 2.84] 117175kN 2.87 14318287- 5603847 Cheers, Heiner
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