else
{
// Continuation history based pruning (~20 Elo)
- if ( lmrDepth < 5
- && (*contHist[0])[movedPiece][to_sq(move)] < 23 - 23 * depth * depth
- && (*contHist[1])[movedPiece][to_sq(move)] < 23 - 23 * depth * depth)
+ if (lmrDepth < 5
+ && (*contHist[0])[movedPiece][to_sq(move)]
+ + (*contHist[1])[movedPiece][to_sq(move)]
+ + (*contHist[3])[movedPiece][to_sq(move)] < -3000 * depth + 3000)
continue;
// Futility pruning: parent node (~5 Elo)
return beta;
}
}
+
+ // Capture extensions for PvNodes and cutNodes
+ else if ( (PvNode || cutNode)
+ && captureOrPromotion
+ && moveCount != 1)
+ extension = 1;
+
+ // Check extensions
else if ( givesCheck
&& depth > 6
&& abs(ss->staticEval) > Value(100))