Author: Heiner Marxen
Date: 16:32:11 04/22/01
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On April 22, 2001 at 18:19:17, leonid wrote: >On April 22, 2001 at 17:36:18, Heiner Marxen wrote: > >>On April 22, 2001 at 09:57:10, leonid wrote: >> >>>Hi! >>> >>>If you want to solve one mate and say your result, then this is the position: >>> >>>[D]2R2bNn/Rp1n1k1b/1q1ppB1p/1Np1p1p1/2P1P2P/3P2PB/4Q2K/8 w - - >>> >>>If you program says nodes/per/second, please indicate it for this position. >> >>According to Chest this is a mate in 7 moves, with 3 solutions: >> >>Bxe6+ Kxe6 Qg4+ Kf7 Qxd7+ Kg6 Qf5+ Kf7 Nxh6+ Bxh6 Rxb7+ =*= Nxd6# >>Qh5+ Bg6 Bxe6+ Kxe6 Qg4+ Bf5 Qxf5+ Kf7 Qh7+ Bg7 Qxg7+ Ke6 Re8# >>Rxf8+ Kxf8 Ra8+ Nb8 Rxb8+ Kf7 Qh5+ Bg6 Qxh6 Qd8 Nxd6+ Kxg8 Qxh8# >> >>On Athlon K7 600 MHz with 350MB hash: 950 seconds, 66,144 nodes/sec. >> >>Just for fun I tried this one also with hash table disabled. Timings: >>depth with without >># 3 0.02 0.02 >># 4 0.42 0.42 >># 5 5.23 6.90 >># 6 62.19 113.11 >># 7 950.10 2285.93 >> >>Heiner > >Hi, Heiner! > >It is look like that we have, in general, very close NPS. With Rebel I could see >that NPS goes somehow down with hash unable. > >Salut, >Leonid. Hello Leonid, Yes, I would expect that NPS goes down with hash table enabled, since maintaining the hash costs time, and does not reduce the work per node, but rather saves complete nodes/subtrees. For the above example without hash table my NPS increases to 73848. Cheers, Heiner
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