An attempt at official-stockfish#2717. Handle search again counter lo…

…cally per thread. Use same TC and threads as test 6272a6afc8f14123163c1997 where this was shown to occur. low tp. Bench: 5845802
miguel-l · Jun 18, 2022 · 07ac76c · 07ac76c
1 parent 6edc29d
commit 07ac76c
Showing 1 changed file with 8 additions and 1 deletion.
diff --git a/src/search.cpp b/src/search.cpp
@@ -314,6 +314,7 @@ void Thread::search() {
   optimism[~us] = -optimism[us];
 
   int searchAgainCounter = 0;
+  bool increaseThreadDepth = true;
 
   // Iterative deepening loop until requested to stop or the target depth is reached
   while (   ++rootDepth < MAX_PLY
@@ -333,7 +334,13 @@ void Thread::search() {
       pvLast = 0;
 
       if (!Threads.increaseDepth)
-         searchAgainCounter++;
+          increaseThreadDepth = false;
+
+      if (!increaseThreadDepth)
+      {
+          searchAgainCounter++;
+          increaseThreadDepth = true;
+      }
 
       // MultiPV loop. We perform a full root search for each PV line
       for (pvIdx = 0; pvIdx < multiPV && !Threads.stop; ++pvIdx)