X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fsearch.cpp;h=e1ca7964922610a7691d9b56543e243ce82d0830;hp=5e3e61b2011925bd3fad886481325098e3ecf634;hb=2af2c67650c4ac2531e6ab2753830f91c0999876;hpb=231103d2cf223a087fc76dbfabc4f44cc42385a6

diff --git a/src/search.cpp b/src/search.cpp
index 5e3e61b2..e1ca7964 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -296,6 +296,7 @@ void Thread::search() {
   MainThread* mainThread = (this == Threads.main() ? Threads.main() : nullptr);
   double timeReduction = 1.0;
   Color us = rootPos.side_to_move();
+  bool failedLow;
 
   std::memset(ss-4, 0, 7 * sizeof(Stack));
   for (int i = 4; i > 0; i--)
@@ -305,7 +306,7 @@ void Thread::search() {
   beta = VALUE_INFINITE;
 
   if (mainThread)
-      mainThread->bestMoveChanges = 0, mainThread->failedLow = false;
+      mainThread->bestMoveChanges = 0, failedLow = false;
 
   size_t multiPV = Options["MultiPV"];
   Skill skill(Options["Skill Level"]);
@@ -346,7 +347,7 @@ void Thread::search() {
 
       // Age out PV variability metric
       if (mainThread)
-          mainThread->bestMoveChanges *= 0.517, mainThread->failedLow = false;
+          mainThread->bestMoveChanges *= 0.517, failedLow = false;
 
       // Save the last iteration's scores before first PV line is searched and
       // all the move scores except the (new) PV are set to -VALUE_INFINITE.
@@ -423,7 +424,7 @@ void Thread::search() {
 
                   if (mainThread)
                   {
-                      mainThread->failedLow = true;
+                      failedLow = true;
                       Threads.stopOnPonderhit = false;
                   }
               }
@@ -471,7 +472,7 @@ void Thread::search() {
           && !Threads.stop
           && !Threads.stopOnPonderhit)
           {
-              const int F[] = { mainThread->failedLow,
+              const int F[] = { failedLow,
                                 bestValue - mainThread->previousScore };
 
               int improvingFactor = std::max(246, std::min(832, 306 + 119 * F[0] - 6 * F[1]));
@@ -522,7 +523,7 @@ namespace {
     constexpr bool PvNode = NT == PV;
     const bool rootNode = PvNode && ss->ply == 0;
 
-    // Check if we have an upcoming move which draws by repetition, or 
+    // Check if we have an upcoming move which draws by repetition, or
     // if the opponent had an alternative move earlier to this position.
     if (   pos.rule50_count() >= 3
         && alpha < VALUE_DRAW
@@ -1164,7 +1165,8 @@ moves_loop: // When in check, search starts from here
     {
         // Quiet best move: update move sorting heuristics
         if (!pos.capture_or_promotion(bestMove))
-            update_quiet_stats(pos, ss, bestMove, quietsSearched, quietCount, stat_bonus(depth));
+            update_quiet_stats(pos, ss, bestMove, quietsSearched, quietCount,
+                               stat_bonus(depth + (bestValue > beta + PawnValueMg ? ONE_PLY : DEPTH_ZERO)));
         else
             update_capture_stats(pos, bestMove, capturesSearched, captureCount, stat_bonus(depth + ONE_PLY));