diff --git a/src/search.cpp b/src/search.cpp index 8ce9c56e..a6618c5b 100644 --- a/src/search.cpp +++ b/src/search.cpp @@ -884,7 +884,7 @@ namespace { // Use qsearch if depth is equal or below zero (~9 Elo) if ( PvNode && !ttMove) - depth -= 2 + 2 * (ss->ttHit && tte->depth() >= depth); + depth -= 2 + 2 * (ss->ttHit && tte->depth() >= depth); if (depth <= 0) return qsearch(pos, ss, alpha, beta); @@ -1141,9 +1141,10 @@ moves_loop: // When in check, search starts here // Decrease reduction if position is or has been on the PV // and node is not likely to fail low. (~3 Elo) + // Decrease further on cutNodes. (~1 Elo) if ( ss->ttPv && !likelyFailLow) - r -= 2; + r -= cutNode && tte->depth() >= depth + 3 ? 3 : 2; // Decrease reduction if opponent's move count is high (~1 Elo) if ((ss-1)->moveCount > 7)