Author: Heiner Marxen
Date: 14:38:14 04/19/02
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On April 18, 2002 at 23:20:40, K. Burcham wrote: > >Mate in 11. >composed by John Kaan > [D] rn1b2rk/1pp3p1/qp1p2R1/5Q2/3RN2P/1PP5/3PbP2/4K3 w - - 0 1 >very difficult for some programs. >kburcham Chest confirms this to be a mate-in-11 with a unique solution key move. (Athlon 1500+ with 128 MB hash, 3.1 hours (CM is much faster ;-)) PV: Rdxd6 cxd6 Nxd6 Re8 Nxe8 Nd7 Rxg7 Qa1+ Kxe2 Qd1+ Kxd1 Ra1+ Ke2 Re1+ Kxe1 Nf6 Rf7 b5 Rf8+ Ng8 Qh5# Timing info # 4 0.01s 1kN [ 3.85] 1.04 191- 0 # 5 0.03s [ 3.00] 5kN [ 4.62] 1.25 709- 0 # 6 0.18s [ 6.00] 30kN [ 5.54] 1.48 3513- 0 # 7 1.13s [ 6.28] 199kN [ 6.71] 1.76 23044- 0 # 8 9.44s [ 8.35] 1644kN [ 8.26] 2.01 208794- 0 # 9 88.53s [ 9.38] 15948kN [ 9.70] 2.37 1994982- 20315 # 10 968.24s [ 10.94] 183351kN [ 11.50] 2.31 19409741- 16210508 # 11 11193.01s [ 11.56] 2129872kN [ 11.62] 2.45 218034072- 214834839 shows that the EBF increased with every additional depth despite the hash table giving better feedback. With more depth we seem to "come closer" to the core of the position, i.e. after black used up its delaying resources more or less carelessly. Cheers, Heiner
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