Simplify weak lever

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 09df1ac2697989e9736ddf4c983c08d7407ce765..eda7f2f771ad37bf9b8bd6fe58fc7124ae68a532 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -277,7 +277,7 @@ void MainThread::search() {
       std::map<Move, int64_t> votes;
       Value minScore = this->rootMoves[0].score;
 
-      // Find out minimum score and reset votes for moves which can be voted
+      // Find out minimum score
       for (Thread* th: Threads)
           minScore = std::min(minScore, th->rootMoves[0].score);
 
@@ -287,7 +287,14 @@ void MainThread::search() {
           votes[th->rootMoves[0].pv[0]] +=
               (th->rootMoves[0].score - minScore + 14) * int(th->completedDepth);
 
-          if (votes[th->rootMoves[0].pv[0]] > votes[bestThread->rootMoves[0].pv[0]])
+          if (bestThread->rootMoves[0].score >= VALUE_MATE_IN_MAX_PLY)
+          {
+              // Make sure we pick the shortest mate
+              if (th->rootMoves[0].score > bestThread->rootMoves[0].score)
+                  bestThread = th;
+          }
+          else if (   th->rootMoves[0].score >= VALUE_MATE_IN_MAX_PLY
+                   || votes[th->rootMoves[0].pv[0]] > votes[bestThread->rootMoves[0].pv[0]])
               bestThread = th;
       }
   }