Computer Chess Club Archives




Subject: Re: Schach 3.0

Author: Vincent Diepeveen

Date: 07:57:11 04/09/02

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On April 09, 2002 at 10:03:49, Robert Hyatt wrote:

>On April 09, 2002 at 00:57:33, Tom Kerrigan wrote:
>>On April 08, 2002 at 13:16:01, Robert Hyatt wrote:
>>>Real programs don't do 500-1000 instructions per node...
>>Heh, that number is dropping pretty quick, huh?
>Nope...  that was Vincent's number, if you would simply read things
>with a bit of care...  My number hasn't changed one iota...  Still well
>over 3000 at least...
>Not quite so easy to calculate for Crafty since the number is different for
>32 bit and 64 bit architectures.  But for Intel, it seems to be in the 6000+

I don't find it that interesting actually, because many nodes which
Schach saw were nothing more than a compare with a register and a return
after that.

Same is true for when diep's king is in check. i don't evaluate these nodes
at all of course. Idem for transpositiontable hits. I don't evaluate
these nodes at all, i get a value from the transpositiontable there.

In short number of clocks a node is always so much depending upon how
many 'cheap' nodes you are doing, because these take the average number
down a lot. way more interesting to see is what actually gets seen in
the evaluation at a leaf position!

All these 500 clocks a node programs share that they are nothing more
than beancounters based upon a piece square table.

Other methods of getting the number of nodes a second higher are
things like lazy evaluation. They produce loads of extra nodes which
are simply inaccurate. Like Bob i don't see these as real nodes at all.

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