Author: Jesus de la Villa
Date: 16:27:06 08/23/00
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On August 23, 2000 at 18:59:24, Christophe Theron wrote: >On August 23, 2000 at 14:30:20, Keith Conary wrote: > >>I currently have an active account which runs Chess Tiger automatically on ICC >>and I've found that running it with the suggested hash table increment of 4-8M >>works well for fast times against computers only. But I get several draws and >>losses to IMs and GMs with the small hash table settings. After increasing the >>hash table size to 64M, I get the opposite effect, meaning I crush the humans >>and lose to the computer at 5 3. Is there a medium that can be reached in >>tigers' settings to balance the performance between humans and computers? >> >>Thanks >> >>Keith > > >Hi Keith! > > >As the author of the engine, I confirm that what you have noticed can only be >explained by "luck" (noise). > >When you play fast time control games with Tiger, you must set the hash table >size to a low value (between 2Mb and 8Mb). This is because Chess Tiger 12.0 >needs to clear the hash tables before every thinking process, and this takes too >much time if your hash tables are big. > >With really big hash tables, you simply waste 0.2 to 0.5 second per move >clearing the tables, and after 100 moves you have simply wasted 50 seconds >clearing them, and will lose on time. > >This problem will totally disappear in the next version of the engine (Chess >Tiger 13), and with the new engine the rule is simple: you give as much RAM for >hash tables as you can, even if you play game in 10 seconds. Because the new >engine does not need to clear the hash tables anymore. > >But until you get the new engine, you need to set a low hash table size when you >play fast time control games. > >And the hash table size has no effect on the playing strength against humans. As >far as I know. > > > > Christophe I can guess that you now do a logical clear, not a physical clear, rigth?
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