Author: José de Jesús García Ruvalcaba
Date: 07:12:37 11/22/01
Go up one level in this thread
On November 22, 2001 at 09:42:36, Robert Hyatt wrote:
>On November 22, 2001 at 05:27:05, Gordon Rattray wrote:
>
>>The Fritz GUI analyses games ("Full Analysis") by starting at the end of the
>>game and retracting moves. How does this compare to going forwards? Does it
>>produce better results?
>>
>>I think this issue has been discussed before, but my search has failed to find
>>anything. Please feel free to forward me a past link if appropriate.
>>
>>Gordon
>
>
>Here is the idea...
>
>If you start at the end of the game, you load the hash table with stuff
>that will help as you search at earlier moves... with the "idea" that
>earlier analysis will be more accurate since it will have access to these
>scores.
>
>It doesn't work however.
>
>IE pick three points in the game, (a) where a key mistake is made, (b) a
>position further into the game, and (c) a position near the end where the
>program can see that it is lost. As you search backward, when you reach
>(b) the search might well _still_ see that it is lost, because of the persistent
>hash entries that help. But when you back up past (b) eventually the
>hash entries get replaced, and you "lose the key scores". You don't find the
>_real_ place where you screwed up (a), instead the score seems to drop at
>(b) which is the wrong place.
>
>Since neither way finds the actual mistake, I don't like the back-to-front
>approach because if you do search front to back you will find the "mistake"
>at a different place, which is nothing more than confusing.
Hi Bob,
would it help to leave the hash entries of the game positions forever in the
hash table?
José.
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