Use less reduction for escaping moves

[stockfish] / src / thread.cpp

diff --git a/src/thread.cpp b/src/thread.cpp
index 30177a3915a84c9245644d779ca6fe0d99bc5a2b..288588b0ee84cd805f0bc4e52868c91e21a81731 100644 (file)
--- a/src/thread.cpp
+++ b/src/thread.cpp
@@ -60,6 +60,7 @@ void Thread::clear() {
   counterMoves.fill(MOVE_NONE);
   mainHistory.fill(0);
   captureHistory.fill(0);
+  previousDepth = 0;
 
   for (bool inCheck : { false, true })
       for (StatsType c : { NoCaptures, Captures })
@@ -236,7 +237,9 @@ 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;
     }