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Subject: Re: Hashing and draw by repetition

Author: Robert Hyatt

Date: 10:24:00 08/27/99

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On August 27, 1999 at 11:47:16, KarinsDad wrote:

>On August 26, 1999 at 10:28:59, Robert Hyatt wrote:
>
>>On August 26, 1999 at 03:23:43, Inmann Werner wrote:
>>
>>>Hello
>>>
>>>When I began to implement hashing, I tried to use all "tricks" to avoid draws
>>>by repetition going into the hash tables, because I thought, this would be very
>>>bad.
>>>Yesterday I disabled this code and let also the draw by repetition evals into
>>>the hash tables, and surprisingly, the program worked better (at the complete
>>>LCTII Test)
>>>
>>>Do you also let "draw by repetition evals" into your hash tables?
>>>
>>>Werner
>>
>>
>>There is one serious error associated with hashing:  lack of path information.
>
>I don't have that problem. I have a list of parents in each hash node. However,
>this has the detriment of forcing me to back scores up all parent paths and the
>detriment of increasing the size of a hash node. You want to hear the music, you
>have to pay the piper.
>
>KarinsDad :)


I'm not sure what you mean by "a list of parents" unless you mean "parent
positions".  Which means you miss a lot of transpositions...  IE there are
lots of ways to reach the same position without having the same position at
the previous move...

Did I misunderstand?



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