X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fsearch.cpp;h=e8ca5c5896d3302edf467b5cedfc11519fb169cd;hb=20484ccdd5876deee4138d8badea4ef44b73341f;hp=26010108dd4c94dfe6066261802b639c8a6cff2d;hpb=0256416bb7b3ba7e96a487062104a9379c0c3a82;p=stockfish

diff --git a/src/search.cpp b/src/search.cpp
index 26010108..e8ca5c58 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -335,6 +335,7 @@ void Thread::search() {
   MainThread* mainThread = (this == Threads.main() ? Threads.main() : nullptr);
   double timeReduction = 1, totBestMoveChanges = 0;
   Color us = rootPos.side_to_move();
+  int iterIdx = 0;
 
   std::memset(ss-7, 0, 10 * sizeof(Stack));
   for (int i = 7; i > 0; i--)
@@ -345,6 +346,16 @@ void Thread::search() {
   bestValue = delta = alpha = -VALUE_INFINITE;
   beta = VALUE_INFINITE;
 
+  if (mainThread)
+  {
+      if (mainThread->previousScore == VALUE_INFINITE)
+          for (int i=0; i<4; ++i)
+              mainThread->iterValue[i] = VALUE_ZERO;
+      else
+          for (int i=0; i<4; ++i)
+              mainThread->iterValue[i] = mainThread->previousScore;
+  }
+
   size_t multiPV = Options["MultiPV"];
 
   // Pick integer skill levels, but non-deterministically round up or down
@@ -520,7 +531,8 @@ void Thread::search() {
           && !Threads.stop
           && !mainThread->stopOnPonderhit)
       {
-          double fallingEval = (354 + 10 * (mainThread->previousScore - bestValue)) / 692.0;
+          double fallingEval = (354 +  6 * (mainThread->previousScore - bestValue)
+                                    +  6 * (mainThread->iterValue[iterIdx]  - bestValue)) / 692.0;
           fallingEval = clamp(fallingEval, 0.5, 1.5);
 
           // If the bestMove is stable over several iterations, reduce time accordingly
@@ -547,6 +559,9 @@ void Thread::search() {
                   Threads.stop = true;
           }
       }
+
+      mainThread->iterValue[iterIdx] = bestValue;
+      iterIdx = (iterIdx + 1) & 3;
   }
 
   if (!mainThread)