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Subject: Re: PV moves extensions

Author: Steve Maughan

Date: 03:28:25 08/31/01

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Bob,

>Probably better is to save the original alpha/beta values at the root,
>and compare to those.  If current alpha = root alpha, and current beta =
>root beta, you are definitely on a PV move search.

Are you sure this is a definitive test?

What if the PV from the last iteration fails low at the new deeper tip i.e. does
not adjust alpha or beta.  This will then be backed up and alternatives will be
tried that are not part of the original PV.  In an exteme case the previous PV
could fail low at the root (which happens reasonably frequently) which will have
meant that every node has been searched with the condition you state.

Or are you defining a PV search as any search that could result in a PV from the
root?

Regards,

Steve

• Re: PV moves extensions Robert Hyatt 06:01:17 08/31/01
  • Re: PV moves extensions Steve Maughan 08:15:33 08/31/01
    • Re: PV moves extensions Robert Hyatt 09:15:07 08/31/01
      • Re: PV moves extensions José Carlos 10:06:06 08/31/01
        • Re: PV moves extensions Miguel A. Ballicora 12:06:05 08/31/01

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