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Exact TT scores and alpha/beta
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Colin Jenkins



Joined: 04 Feb 2014
Posts: 297
Location: Mumbles, Wales, UK.

PostPost subject: Exact TT scores and alpha/beta    Posted: Thu Feb 23, 2017 11:38 am Reply to topic Reply with quote

I'm confused.

If a TT score (with an associated move) at a node is exact I've been returning it without reference to node type or current alpha/beta.

But I notice that that seems to be wrong - and at a PV node one should only return an exact score if it lies within the current alpha/beta window.

I don't follow why. OK, the score is not exact based on the current window, but it has been exact based on a wider window, so surely it's still valid (like mate scores after the move loop are) - it's an exact score for the position but in the context is an alpha/beta cut. Also it seems to me that mate scores will get filtered out by limiting exact score to the current window.

I'm missing something obviously, but what...? Smile

Fail soft context.
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Display posts from previous:   
Subject Author Date/Time
Exact TT scores and alpha/beta Colin Jenkins Thu Feb 23, 2017 11:38 am
      Re: Exact TT scores and alpha/beta Álvaro Begué Thu Feb 23, 2017 12:28 pm
            Re: Exact TT scores and alpha/beta Colin Jenkins Thu Feb 23, 2017 12:37 pm
      Re: Exact TT scores and alpha/beta Sven Schüle Thu Feb 23, 2017 2:01 pm
            Re: Exact TT scores and alpha/beta Colin Jenkins Thu Feb 23, 2017 2:39 pm
                  Re: Exact TT scores and alpha/beta Sven Schüle Thu Feb 23, 2017 3:35 pm
                        Re: Exact TT scores and alpha/beta Sven Schüle Thu Feb 23, 2017 4:03 pm
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