Researching if LMR-affected search improves Alpha?

JVMerlino · Post by **JVMerlino** » Fri Jan 22, 2010 9:58 pm

I can't remember where I saw this, but in Myrddin I have coded the search such that, if a move had LMR reductions applied to it and the search then improves Alpha, that the move should then be researched at the unreduced depth.

Does anybody else do this?

Many thanks in advance,
jm

Roman Hartmann · Post by **Roman Hartmann** » Fri Jan 22, 2010 10:11 pm

Yes, I'm doing that too. I took the LMR-sheme from Tords website btw (maybe you saw it there too) and it works just nicely and even though I tried to modify LMR several times the research with unreduced depth after improving alpha seems to work best for me.

Roman

zamar · Post by **zamar** » Fri Jan 22, 2010 10:13 pm

Stockfish does that.

Michael Sherwin · Post by **Michael Sherwin** » Fri Jan 22, 2010 10:51 pm

RomiChess is that way.

bob · Post by **bob** » Fri Jan 22, 2010 11:40 pm

JVMerlino wrote:I can't remember where I saw this, but in Myrddin I have coded the search such that, if a move had LMR reductions applied to it and the search then improves Alpha, that the move should then be researched at the unreduced depth.

Does anybody else do this?

Many thanks in advance,
jm

So far as I know, _everybody_ does this.

JVMerlino · Post by **JVMerlino** » Fri Jan 22, 2010 11:42 pm

Well, there it is then.

Thanks to everybody who replied!

jm

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