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Decrease LMR at PV nodes with low depth. #3985

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Decrease LMR at PV nodes with low depth. #3985

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1 change: 1 addition & 0 deletions AUTHORS
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Original file line number Diff line number Diff line change
Expand Up @@ -104,6 +104,7 @@ jundery
Justin Blanchard (UncombedCoconut)
Kelly Wilson
Ken Takusagawa
Kian E
kinderchocolate
Kiran Panditrao (Krgp)
Kojirion
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4 changes: 4 additions & 0 deletions src/search.cpp
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Expand Up @@ -1173,6 +1173,10 @@ namespace {
if (PvNode && !ss->inCheck && abs(ss->staticEval - bestValue) > 250)
r--;

// Increase depth based reduction if PvNode
if (PvNode)
r -= 15 / ( 3 + depth );

ss->statScore = thisThread->mainHistory[us][from_to(move)]
+ (*contHist[0])[movedPiece][to_sq(move)]
+ (*contHist[1])[movedPiece][to_sq(move)]
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