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Subject: Re: MTD Drivers

Author: Stuart Cracraft

Date: 20:44:49 08/10/04

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On August 10, 2004 at 17:11:44, Tor Lattimore wrote:

>On August 10, 2004 at 11:07:17, Tord Romstad wrote:
>
>>On August 10, 2004 at 10:26:12, Andrew Williams wrote:
>>
>>>On August 10, 2004 at 08:38:28, Tor Lattimore wrote:
>>>
>>>>Hi.
>>>>I recently converted my program to MTD. It's working quite well and performing
>>>>just a tad better than the old alpha-beta with pvs + hash ec cetera...
>>>>my question is, what sort of drivers are people using, with what sort of steps?
>>>>I have been fiddling arround, with a little success, just interested to know
>>>>what others do.
>>>>Cheers
>>>>Tor
>>>
>>>Mine goes up or down in increasing steps up to size 7. I've tried all sorts of
>>>things over the years. What works out best will vary with the nature of your
>>>evaluation.
>>
>>I increase the step size all the way up to a pawn.  When the direction of
>>the search changes (i.e. when the search fails in a different direction
>>compared to the previous searches), I reduce the step size to 1 again.
>>
>>I agree that the optimal approach will almost certainly depend on the
>>program.
>>
>>Tord
>
>Thanks, i'll try that system :)

Don't know if it was you who suggested it but I reduced material
to 64 for pawn, etc. then make the change 1, 2, 4, 8, etc. up to max
of 32 and back down again.

Was not competitive with PVS (so far). Haven't had time to work on it.

Lost in a maze of twisty passages, all alike...

Stuart



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