X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;ds=sidebyside;f=src%2Fsearch.cpp;h=c1ed1f9540a059b7222a4c1663b771847dcfb0c2;hb=7150183d07a40653aff6ba64a73f27fe049f525d;hp=ec9c6b1d0507c77734f92fe8d3a7d067de2334d4;hpb=69204f0720bba198952fb7a848ed4377430ef433;p=stockfish

diff --git a/src/search.cpp b/src/search.cpp
index ec9c6b1d..c1ed1f95 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -564,6 +564,7 @@ void Thread::search() {
                   Threads.stop = true;
           }
           else if (   Threads.increaseDepth
+                   && !mainThread->ponder
                    && Time.elapsed() > Time.optimum() * fallingEval * reduction * bestMoveInstability * 0.6)
                    Threads.increaseDepth = false;
           else
@@ -1015,11 +1016,11 @@ moves_loop: // When in check, search starts from here
               // Futility pruning: parent node (~5 Elo)
               if (   lmrDepth < 6
                   && !inCheck
-                  && ss->staticEval + 255 + 182 * lmrDepth <= alpha
+                  && ss->staticEval + 235 + 172 * lmrDepth <= alpha
                   &&  thisThread->mainHistory[us][from_to(move)]
                     + (*contHist[0])[movedPiece][to_sq(move)]
                     + (*contHist[1])[movedPiece][to_sq(move)]
-                    + (*contHist[3])[movedPiece][to_sq(move)] < 30000)
+                    + (*contHist[3])[movedPiece][to_sq(move)] < 25000)
                   continue;
 
               // Prune moves with negative SEE (~20 Elo)
@@ -1185,6 +1186,10 @@ moves_loop: // When in check, search starts from here
               r -= ss->statScore / 16384;
           }
 
+          // Increase reduction for captures/promotions if late move and at low depth
+          else if (depth < 8 && moveCount > 2)
+              r++;
+
           Depth d = clamp(newDepth - r, 1, newDepth);
 
           value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, d, true);