Tweak history initialization

[stockfish] / src / thread.cpp

diff --git a/src/thread.cpp b/src/thread.cpp
index 08a78db5f31da450fa7c4003272dff78c4162ce6..9ce408e059e02ac119d567a1eda7377f96110f7c 100644 (file)
--- a/src/thread.cpp
+++ b/src/thread.cpp
@@ -61,15 +61,12 @@ void Thread::clear() {
   mainHistory.fill(0);
   captureHistory.fill(0);
   previousDepth = 0;
-  
+
   for (bool inCheck : { false, true })
       for (StatsType c : { NoCaptures, Captures })
-      {
           for (auto& to : continuationHistory[inCheck][c])
-                for (auto& h : to)
-                      h->fill(-71);
-          continuationHistory[inCheck][c][NO_PIECE][0]->fill(Search::CounterMovePruneThreshold - 1);
-      }
+              for (auto& h : to)
+                  h->fill(-71);
 }
 
 
@@ -237,7 +234,9 @@ Thread* ThreadPool::get_best_thread() const {
         }
         else if (   th->rootMoves[0].score >= VALUE_TB_WIN_IN_MAX_PLY
                  || (   th->rootMoves[0].score > VALUE_TB_LOSS_IN_MAX_PLY
-                     && votes[th->rootMoves[0].pv[0]] > votes[bestThread->rootMoves[0].pv[0]]))
+                     && (   votes[th->rootMoves[0].pv[0]] > votes[bestThread->rootMoves[0].pv[0]]
+                         || (   votes[th->rootMoves[0].pv[0]] == votes[bestThread->rootMoves[0].pv[0]]
+                             && th->rootMoves[0].pv.size() > bestThread->rootMoves[0].pv.size()))))
             bestThread = th;
     }