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Subject: PVS and PV

Author: Frank Schneider

Date: 04:48:58 04/22/01

Hi,

Gromit uses the standard PVS and sometimes after (e.g.) a fail-high
it only gets very short PVs. The reason is that after searching

failhighscore = -pvs(-beta, -alpha);  // returns failhighscore >= beta

the research is done with

realscore = -pvs(-infinite, -failhighscore);

This search may return realscore == failhighscore and in this case
the PV is not saved, because the score is not inside the searchwindow.

Of course it would be possible to do the research with a window of
(-infinite, -(failhighscore-1)), but this needs slightly more nodes.

How do others ensure to get "good" PVs?

Frank

Re: PVS and PV Vincent Diepeveen 15:12:29 04/22/01
Re: PVS and PV Robert Hyatt 07:21:27 04/22/01

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