Author: Christophe Theron
Date: 20:05:05 08/23/00
Go up one level in this thread
On August 23, 2000 at 19:27:06, Jesus de la Villa wrote:
>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?
I don't clear at all.
Christophe
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