X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fsearch.cpp;h=727990dc9d354b753004ae37b61afd7f2c1d28ad;hp=814a96d98cb66abed49d617566001b350d349798;hb=7e9f776fcafe0121c7449f4339b26d77c14adf50;hpb=e14046517ed0a690c0969b3ca8d1b0e25ac9fb9e

diff --git a/src/search.cpp b/src/search.cpp
index 814a96d9..727990dc 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -902,7 +902,7 @@ moves_loop: // When in check and at SpNode search starts from here
           // Futility pruning: parent node
           if (predictedDepth < 7 * ONE_PLY)
           {
-              futilityValue =  ss->staticEval + futility_margin(predictedDepth) + 256;
+              futilityValue = ss->staticEval + futility_margin(predictedDepth) + 256;
 
               if (futilityValue <= alpha)
               {
@@ -959,7 +959,10 @@ moves_loop: // When in check and at SpNode search starts from here
                                         [pos.piece_on(to_sq(move))][to_sq(move)] <= VALUE_ZERO))
               ss->reduction += ONE_PLY;
 
-          if (move == countermove)
+          if (    move == countermove
+              || (   History[pos.piece_on(to_sq(move))][to_sq(move)] > VALUE_ZERO
+                  && CounterMovesHistory[pos.piece_on(prevMoveSq)][prevMoveSq]
+                                        [pos.piece_on(to_sq(move))][to_sq(move)] > VALUE_ZERO))
               ss->reduction = std::max(DEPTH_ZERO, ss->reduction - ONE_PLY);
 
           // Decrease reduction for moves that escape a capture
@@ -975,13 +978,6 @@ moves_loop: // When in check and at SpNode search starts from here
 
           value = -search<NonPV, false>(pos, ss+1, -(alpha+1), -alpha, d, true);
 
-          // Re-search at intermediate depth if reduction is very high
-          if (value > alpha && ss->reduction >= 4 * ONE_PLY)
-          {
-              Depth d2 = std::max(newDepth - 2 * ONE_PLY, ONE_PLY);
-              value = -search<NonPV, false>(pos, ss+1, -(alpha+1), -alpha, d2, true);
-          }
-
           doFullDepthSearch = (value > alpha && ss->reduction != DEPTH_ZERO);
           ss->reduction = DEPTH_ZERO;
       }