Stockfish question

[jwes]

What would it take to have stockfish do tt cutoffs at pv nodes? I tried copying the code from search to searchpv, but it didn't seem to work right. Is there something else I would need to do? The reason I want to do this is for reverse analysis.

[zamar]

Is there something else I would need to do? The reason I want to do this is for reverse analysis.

Yes, you need to remember that in PV nodes alpha != beta -1.
So ok_to_use_TT needs to be written differently. And it's not too obvious how this should be done, there are many alternatives.

[jwes]

Is there something else I would need to do? The reason I want to do this is for reverse analysis.

Yes, you need to remember that in PV nodes alpha != beta -1.
So ok_to_use_TT needs to be written differently. And it's not too obvious how this should be done, there are many alternatives.

It appears that ok_to_use_TT treats exact nodes as both upper and lower so it returns true if it is deep enough so just removing the test for PvNode seems to work.