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Increase LMR when TT move is a capture #19

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Increase LMR when TT move is a capture #19

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6 changes: 5 additions & 1 deletion src/search.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -515,7 +515,11 @@ namespace ironphoenix {
if (lmrEligible) {
reduction = lmrBaseReduction(depth, legalMoves);

// Reduction adjustments go here!
// If the TT move is tactical, reduce competing late quiet
// moves one extra ply. The TT move itself cannot reach this
// path because LMR is only applied to quiet moves here.
if (ttMove && ttMove.isCapture())
++reduction;

reduction = std::clamp(reduction, 0, depth - 2);
}
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