diff --git a/src/search.cpp b/src/search.cpp
index e73f68ff..b3f60f3d 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -244,7 +244,7 @@ void MainThread::search() {
 
   // Send again PV info if we have a new best thread
   if (bestThread != this)
-      sync_cout << UCI::pv(bestThread->rootPos, bestThread->completedDepth, -VALUE_INFINITE, VALUE_INFINITE) << sync_endl;
+      sync_cout << UCI::pv(bestThread->rootPos, bestThread->completedDepth) << sync_endl;
 
   sync_cout << "bestmove " << UCI::move(bestThread->rootMoves[0].pv[0], rootPos.is_chess960());
 
@@ -392,7 +392,7 @@ void Thread::search() {
                   && multiPV == 1
                   && (bestValue <= alpha || bestValue >= beta)
                   && Time.elapsed() > 3000)
-                  sync_cout << UCI::pv(rootPos, rootDepth, alpha, beta) << sync_endl;
+                  sync_cout << UCI::pv(rootPos, rootDepth) << sync_endl;
 
               // In case of failing low/high increase aspiration window and
               // re-search, otherwise exit the loop.
@@ -423,7 +423,7 @@ void Thread::search() {
 
           if (    mainThread
               && (Threads.stop || pvIdx + 1 == multiPV || Time.elapsed() > 3000))
-              sync_cout << UCI::pv(rootPos, rootDepth, alpha, beta) << sync_endl;
+              sync_cout << UCI::pv(rootPos, rootDepth) << sync_endl;
       }
 
       if (!Threads.stop)
@@ -1246,6 +1246,8 @@ moves_loop: // When in check, search starts here
           {
               rm.score = value;
               rm.selDepth = thisThread->selDepth;
+              rm.scoreLowerbound = value >= beta;
+              rm.scoreUpperbound = value <= alpha;
               rm.pv.resize(1);
 
               assert((ss+1)->pv);
@@ -1820,7 +1822,7 @@ void MainThread::check_time() {
 /// UCI::pv() formats PV information according to the UCI protocol. UCI requires
 /// that all (if any) unsearched PV lines are sent using a previous search score.
 
-string UCI::pv(const Position& pos, Depth depth, Value alpha, Value beta) {
+string UCI::pv(const Position& pos, Depth depth) {
 
   std::stringstream ss;
   TimePoint elapsed = Time.elapsed() + 1;
@@ -1858,8 +1860,8 @@ string UCI::pv(const Position& pos, Depth depth, Value alpha, Value beta) {
       if (Options["UCI_ShowWDL"])
           ss << UCI::wdl(v, pos.game_ply());
 
-      if (!tb && i == pvIdx)
-          ss << (v >= beta ? " lowerbound" : v <= alpha ? " upperbound" : "");
+      if (i == pvIdx && !tb && updated) // tablebase- and previous-scores are exact
+         ss << (rootMoves[i].scoreLowerbound ? " lowerbound" : (rootMoves[i].scoreUpperbound ? " upperbound" : ""));
 
       ss << " nodes "    << nodesSearched
          << " nps "      << nodesSearched * 1000 / elapsed
diff --git a/src/search.h b/src/search.h
index f264bcae..60f2762a 100644
--- a/src/search.h
+++ b/src/search.h
@@ -71,6 +71,8 @@ struct RootMove {
   Value score = -VALUE_INFINITE;
   Value previousScore = -VALUE_INFINITE;
   Value averageScore = -VALUE_INFINITE;
+  bool scoreLowerbound = false;
+  bool scoreUpperbound = false;
   int selDepth = 0;
   int tbRank = 0;
   Value tbScore;
diff --git a/src/uci.h b/src/uci.h
index 7a2ef255..3b5a6764 100644
--- a/src/uci.h
+++ b/src/uci.h
@@ -79,7 +79,7 @@ void loop(int argc, char* argv[]);
 std::string value(Value v);
 std::string square(Square s);
 std::string move(Move m, bool chess960);
-std::string pv(const Position& pos, Depth depth, Value alpha, Value beta);
+std::string pv(const Position& pos, Depth depth);
 std::string wdl(Value v, int ply);
 Move to_move(const Position& pos, std::string& str);