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Subject: Re: The Baron 1.0 (ICT-3) available

Author: Richard Pijl

Date: 00:29:00 05/19/03

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On May 18, 2003 at 18:54:51, Will Singleton wrote:

>On May 18, 2003 at 18:17:09, Richard Pijl wrote:
>
>>Hi,
>>
>>The Baron 1.0 is available from the Baron's Lair
>>(http://home.wanadoo.nl/richard.pijl).
>>
>>This is the single-CPU version of the program that participated in ICT-3 in
>>Leiden.
>>
>>have fun,
>>Richard.
>
>Congratulations on a fine performance.  Any impressions, anecdotes?  What type
>of improvement do you get from 2 cpus?  What multi approach do you use?
>
>Will

Hi Will,

I'm using a quite cheap SMP method: A variant of ABDADA.

Basically it is starting two 'Baron' processes that are both thinking on the
same position, but share the hash table. To prevent the two processes to search
roughly the same tree, I changed the second process to use MTD(f) instead of
PVS. I haven't tested the speedup thouroughly, but I believe Baron reaches a
speedup around 1.4.

As usual it has been a very pleasant tournament to play in. The group of
participants is a group of friends which makes the atmosphere great. I can
really recommend participating in one of the 'Leiden' tournaments if you're in
the neighbourhood. Next tournament will be in October ...

Richard.



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