Change handling the special case of a single legal move.

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 12c32194eb95436726f0c484f7cdd2988a65b20e..6e37fba1e524f8725d9737cab9568ea5d7081e4d 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -521,10 +521,14 @@ void Thread::search() {
           }
           double bestMoveInstability = 1 + 2 * totBestMoveChanges / Threads.size();
 
-          double totalTime = rootMoves.size() == 1 ? 0 :
-                             Time.optimum() * fallingEval * reduction * bestMoveInstability;
+          double totalTime = Time.optimum() * fallingEval * reduction * bestMoveInstability;
 
-          // Stop the search if we have exceeded the totalTime, at least 1ms search
+          // Cap used time in case of a single legal move for a better viewer experience in tournaments
+          // yielding correct scores and sufficiently fast moves.
+          if (rootMoves.size() == 1)
+              totalTime = std::min(500.0, totalTime);
+
+          // Stop the search if we have exceeded the totalTime
           if (Time.elapsed() > totalTime)
           {
               // If we are allowed to ponder do not stop the search now but