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Subject: Re: Null Move Hash Table Issues

Author: Andrew Platt

Date: 08:00:12 09/09/04

Go up one level in this thread


On September 09, 2004 at 10:36:26, Robert Hyatt wrote:

>>Qxf4 Be5 Rxh5 Bxf4 (ply 4, depth 270)
>>
>>In iteration 10 the search reaches this point pretty quickly:
>>
>>Qxf4 Bxf4 Rxh5 NULL_MOVE (ply 4, depth 210)
>>
>>Since with the null move this becomes white to move, that makes the position
>>identical to the one above stored in the hash table.
>
>Maybe I don't understand your explanation, but I do not see how this is
>possible.  The position after Qxf4 Be5 Rxh5 Bxf4 is _not_ the same as the
>position after Qxf4 Be5 Rxh5 NULL.

That's not quite the search I described. The second one is Qxf4 *Bxf4* Rxh5 NULL
which as far as I can see is identical to the first one.

Andy.



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