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Subject: Re: 0x88 vs 144 (or 12x12)

Author: Dann Corbit

Date: 11:28:41 10/28/02

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On October 28, 2002 at 01:54:35, Ricardo Gibert wrote:

>On October 28, 2002 at 00:46:03, Dann Corbit wrote:
>
>>On October 27, 2002 at 01:37:13, Ricardo Gibert wrote:
>>
>>>On October 26, 2002 at 22:37:59, Russell Reagan wrote:
>>>
>>>>On October 26, 2002 at 07:41:41, Ricardo Gibert wrote:
>>>>
>>>>>No collision errors if the 64 bits are stored in the table.
>>>>
>>>>That *might* be true if you had a perfect hash key generation algorithm, where
>>>>each pawn formation mapped to exactly 1 hash key, but that is not the case.
>>>>
>>>>Russell
>>>
>>>
>>>I'm wasn't talking about collisions in general. I'm talking about collision
>>>*errors* where 1 pawn structure is mistaken for another. When you stated, "It
>>>makes me wonder if there are ever *errors* caused by this" is what I addressing.
>>
>>Then store the 64 bit formation described and a collision is impossible.
>
>Look at the bottom of http://www.talkchess.com/forums/1/message.html?261847

Well, obviously, you can calculate statistics for collisions easily with this
information, since you understand it.

It might be very useful to calculate the optimal hash size for a given set of
search parameters.



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