Simplification away Cutoff Reset

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 77619345c8f397cc9f7d577a20063f460c6973d5..fa87f1c3f0f3a4aced851f4ef795d08c8f5a568d 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1184,8 +1184,11 @@ moves_loop: // When in check, search starts here
           // Do full depth search when reduced LMR search fails high
           if (value > alpha && d < newDepth)
           {
+              // Adjust full depth search based on LMR results - if result
+              // was good enough search deeper, if it was bad enough search shallower
               const bool doDeeperSearch = value > (alpha + 64 + 11 * (newDepth - d));
-              value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth + doDeeperSearch, !cutNode);
+              const bool doShallowerSearch = value < bestValue + newDepth;
+              value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth + doDeeperSearch - doShallowerSearch, !cutNode);
 
               int bonus = value > alpha ?  stat_bonus(newDepth)
                                         : -stat_bonus(newDepth);
@@ -1292,8 +1295,6 @@ moves_loop: // When in check, search starts here
               }
           }
       }
-      else
-         ss->cutoffCnt = 0;
 
 
       // If the move is worse than some previously searched move, remember it to update its stats later