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Subject: Re: Gerbil implementation request to Bruce Moreland

Author: José Carlos

Date: 23:54:39 08/09/01

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On August 09, 2001 at 13:48:08, Alvaro Jose Povoa Cardoso wrote:

>>Note that my hash table has two scores and two drafts per position.
>>
>>Hope this is useful.
>>
>>Andrew
>
>
>Could you please explain why your hash table has two scores and two drafts per
>position?
>
>Thank you,
>Alvaro Cardoso

  If I'm not wrong, he uses MTD(f). MTD(f) relies on failing high or low
everywhere, using null windows, instead of calculating "true" values with an
open window. So, in MTD(f), it's very important to have an upper and lower bound
for every node in the hash table, so that you have relevant information no
matter if the true value lies above or below your null window.

  José C.

• Re: Gerbil implementation request to Bruce Moreland Andrew Williams 02:29:52 08/10/01

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