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Adjust pruning constants. #3885

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Adjust pruning constants. #3885

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6 changes: 3 additions & 3 deletions src/search.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1040,7 +1040,7 @@ namespace {
continue;

// SEE based pruning (~9 Elo)
if (!pos.see_ge(move, Value(-218) * depth))
if (!pos.see_ge(move, Value(-217) * depth))
continue;
}
else
Expand All @@ -1051,15 +1051,15 @@ namespace {

// Continuation history based pruning (~2 Elo)
if ( lmrDepth < 5
&& history < -3000 * depth + 3000)
&& history < -3875 * (depth - 1))
continue;

history += thisThread->mainHistory[us][from_to(move)];

// Futility pruning: parent node (~9 Elo)
if ( !ss->inCheck
&& lmrDepth < 8
&& ss->staticEval + 142 + 139 * lmrDepth + history / 64 <= alpha)
&& ss->staticEval + 138 + 137 * lmrDepth + history / 64 <= alpha)
continue;

// Prune moves with negative SEE (~3 Elo)
Expand Down