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Subject: Re: Interesting 21 ply search result by Fritz 7

Author: Uri Blass

Date: 23:07:25 02/24/02

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On February 25, 2002 at 01:49:32, Gian-Carlo Pascutto wrote:

>On February 25, 2002 at 00:02:50, Robert Hyatt wrote:
>
>>I don't "believe" it is impossible to find it from the Kf1 position, I
>>_know_ it is impossible for a program to find this perpetual.
>
>Okay, but then please explain why Fritz, with a 21 ply nominal
>search & a 53 ply of extensions returns _exactly_ that: a draw
>score.
>
>--
>GCP

I hvae some possible explanations:

1)maybe you do not need full 60 plies.
I saw no proof that you need 60 plies to see the draw.

It is better to post the line of 60 plies so people can find if
this is really the only line for black to force repetition and that black has no
alternative to force repetition with a shorter line.

2)hash tables may help and program can see 60 plies forward when the maximal
depth is 53 plies thanks to hash tables.

Uri



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