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Subject: Re: Unique nodes, en passant and perfect hashing

Author: Ulrich Tuerke

Date: 07:46:34 11/25/99

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On November 25, 1999 at 10:19:47, Dave Gomboc wrote:

>On November 25, 1999 at 10:11:58, Ulrich Tuerke wrote:
>
>>I find your results very interesting.
>>
>>What puzzles me, is the large branching ratio from one iteration to the next one
>>which you obtained. I'd thought, that you get a factor of 4 to 5, provided you
>>have a resonable move ordering, whereas you have factor of ~20. Could it be that
>>your move ordering is very poor ?
>>
>>I assume, with an improved move ordering, the effects, which you have observed,
>>will also become less drastic.
>>
>>Nevertheless, it might be worthwhile to try your suggestion regarding en
>>passant.
>>
>>Thanks,
>>Uli
>
>I think he was counting nodes for a complete traversal (minimax).  For instance,
>the leftmost column of the third table goes 1 node, 21 nodes, 421 nodes, ...
>
>Dave

Yes, you are certainly right, Dave.
Of course, we have far more transpositions in this case than in the realistic
case of alpha-beta.

Uli



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