Author: Tord Romstad
Date: 04:09:34 06/09/05
Go up one level in this thread
On June 08, 2005 at 15:42:55, Vladimir Xern wrote: >On June 08, 2005 at 11:21:30, Steve Maughan wrote: > >>Vladimir, >> >>>You should try Ruffian 1.0.5 in this position. It finds the mate after about >>>5 and a half minutes, second to The King's 2:30 >> >>Glaurung does better, finding Bh7 in 3 secs, announces mate in 17 after 1:44 and >>resolves to mate in 14 after 2:15 - (running on a 2 GHz Centrino) Which is no big surprise. Glaurung and Gothmog love bishop sacs on h7, and often play them even when they are unsound. >That surely is an impressive laptop. My 1.4 GHz Athlon cannot compare. Here's >Glaurung on my machine, albeit with 64 MB hash, though I doubt that matters too >much. In fact, it is very likely that it does. When thinking for several minutes, big hash tables help a lot for Glaurung. Here are the times needed to find mate in 15 and 14 from this position on my iMac G5 1.8 GHz with various hash table sizes: -----------+---------------+---------------+---------------+---------------+ Hash | 32 MB | 64 MB | 128 MB | 256 MB | -----------+---------------+---------------+---------------+---------------+ Mate in 15 | 8:20,15 plies | 6:01,15 plies | 3:05,15 plies | * | Mate in 14 |10:18,16 plies | 8:17,16 plies | 4:02,16 plies | 2:15,15 plies | -----------+---------------+---------------+---------------+---------------+ As you can see, from 64 MB to 256 MB each doubling of hash table size reduces the time by a factor of about 2. Tord
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.