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Setting the reduction of move == ttMove to 0 #4863

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Setting the reduction of move == ttMove to 0 #4863

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a8cae8a
bench: 1110556
FauziAkram Nov 5, 2023
c9ece75
Update search.cpp
FauziAkram Nov 5, 2023
3d02f3b
bench: 1110556
FauziAkram Nov 5, 2023
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5 changes: 3 additions & 2 deletions src/search.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1140,9 +1140,10 @@ Value search(Position& pos, Stack* ss, Value alpha, Value beta, Depth depth, boo
if ((ss + 1)->cutoffCnt > 3)
r++;

// Decrease reduction for first generated move (ttMove)
// Set reduction to 0 for first generated move (ttMove)
// Nullifies all previous reduction adjustments to ttMove and leaves only history to do them
else if (move == ttMove)
r--;
r = 0;

ss->statScore = 2 * thisThread->mainHistory[us][from_to(move)]
+ (*contHist[0])[movedPiece][to_sq(move)]
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