Fix out-of-bound array access printing ponder move

It is possible that we won't have a ponder move if our PV
is too short.  In that case, just don't print a ponder move.

No functional change

Resolves #130

diff --git a/src/search.cpp b/src/search.cpp
index 9f2786230477737160147feba907bb5fed0ed02b..11ba939a95153384267210921f8032ffbf5199cb 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -217,9 +217,12 @@ void Search::think() {
       RootPos.this_thread()->wait_for(Signals.stop);
   }
 
-  sync_cout << "bestmove " << UCI::format_move(RootMoves[0].pv[0], RootPos.is_chess960())
-            << " ponder "  << UCI::format_move(RootMoves[0].pv[1], RootPos.is_chess960())
-            << sync_endl;
+  sync_cout << "bestmove " << UCI::format_move(RootMoves[0].pv[0], RootPos.is_chess960());
+
+  if (RootMoves[0].pv.size() > 1)
+      std::cout << " ponder " << UCI::format_move(RootMoves[0].pv[1], RootPos.is_chess960());
+
+  std::cout << sync_endl;
 }