Author: Heiner Marxen
Date: 03:51:32 11/09/01
Go up one level in this thread
On November 07, 2001 at 12:43:00, leonid wrote: >On November 07, 2001 at 12:00:27, Paul wrote: > >>On November 07, 2001 at 08:23:57, leonid wrote: >> >>>Hi! >>> >>>I hope that your program will do better that mine on this position. For mine it >>>went slow on selective and brute force search. At the same time position look >>>like very usual. >>> >>>[D]qrkrqqbq/2b5/2q5/QBpNRN2/2n2Q2/2n2P2/2p2B2/QRqQQKQR w - - >>> >>>Please indicate your result. >> >>Well, mine is certainly even slower than yours on this position. My old settings >>found the following on my p3/1000: >> >>03:49 WM13 09 Qxc7+ Qxc7 Nde7+ Qexe7 Nxe7+ Qfxe7 Qgg4+ Be6 Qxe6+ Qxe6 Bd7+ Qcxd7 >>Rxc5+ Qec6 Rxb8+ Qxb8 Qxd7+ Rxd7 Qa6+ Qb7 Rxh8+ Rd8 Rxc6+ Kd7 Qxb7# >> >>Then I checked my new settings, and they showed this: >> >>07:34 WM12 10 Qxc7+ Qxc7 Nde7+ Qexe7 Nxe7+ Qfxe7 Qgg4+ Be6 Qxe6+ Qxe6 Bd7+ Qexd7 >>Qxd7+ Qxd7 Rxc5+ Qdc6 Rxc6+ Qxc6 Rxb8+ Kd7 Qa7+ Qb7 Qxb7# >> >>So a shorter mate in a longer time. It seems mine likes positions where the >>pieces are closer together better ... this one's too spacey ... ;) > >Hi! > >This is very often seen case with selective search where some selective way will >demand more moves to see but will waist less time. Less time since conditions >are more restrictive. Best selective search (in my mind) is the search that will >find shortest move for the most competitive time. > >Your time is all the time excellent and pretty closed to mine. Since your use >program that is not exactly mate solver, you do better that me. > >My selective found mate in 12 moves in 3 min and 15 sec. This time Chest is not very helpful: After 7.6 hours (K7/600, 350 MB) it finds "No solution in 9 moves." Some timing info: # 1 0.00s 0kN 0.87 1- 0 # 2 0.00s 0kN 1.00 1- 0 # 3 0.02s 1kN [ 13.89] 0.96 89- 0 # 4 0.21s [ 10.50] 11kN [ 8.07] 1.05 1035- 0 # 5 2.22s [ 10.57] 123kN [ 11.50] 1.16 10357- 0 # 6 28.74s [ 12.95] 1677kN [ 13.69] 1.30 161321- 0 # 7 233.52s [ 8.13] 13616kN [ 8.12] 1.51 1382588- 1 # 8 2440.23s [ 10.45] 136971kN [ 10.06] 1.71 14417931- 5699832 # 9 27315.27s [ 11.19] 1486887kN [ 10.86] 1.83 162324161- 153576260 An EBF around 10 is a bit too much for more depth. Einen schönen Tag noch, Heiner
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