Author: Heiner Marxen
Date: 14:28:50 06/01/01
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On June 01, 2001 at 16:44:15, leonid wrote: >Hello! > >If you would like to solve one mate in the Friday then look into this: > >[D]Q2r1BBQ/5Q2/1NQ4R/qqn3qr/NQq1n3/bbpQ3Q/k1p1Q2p/1qnRK1Q1 w - - > >Please indicate your result. > >Thanks, >Leonid. Black has some dangerous resources, so this should be relatively easy for Chest... in 17.4 minutes on a K7/600 with 350MB hash we have a mate in 11: Qdxc2+ Qxc2 Qxc2+ Bxc2 Nxc3+ Nxc3 Qfxc4+ Qxc4 Bxc4+ Bb3 Bxb3+ N1xb3 Qxa3+ Qxa3 Qxa3+ Kxa3 Ra1+ Nxa1 Q3xc3+ Ka2 Qb2# Except for the last depth the effective branching factor of Chest is quite fine (i.e. small): depth seconds # 1 0.00 0.87 1- 0 # 2 0.00 1.00 1- 0 # 3 0.02 0.93 123- 0 # 4 0.15 1.04 820- 0 # 5 0.58 1.26 3530- 0 # 6 1.92 1.57 11287- 0 # 7 5.64 2.12 31351- 0 # 8 16.06 3.22 87521- 0 # 9 43.20 4.59 237290- 0 # 10 130.78 5.69 733419- 0 # 11 1042.10 4.80 5721756- 74992 43.20 / 16.06 = 2.689 130.78 / 43.20 = 3.027 1042.10 / 130.78 = 7.968 Cheers, Heiner
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