Fix extract_ponder_from_tt()

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 97ab5918ae808090ca181aab078e35f15f8399d4..b735281729e78387359866d60d36f20d936e6165 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1574,16 +1574,16 @@ bool RootMove::extract_ponder_from_tt(Position& pos)
 
     pos.do_move(pv[0], st, pos.gives_check(pv[0], CheckInfo(pos)));
     TTEntry* tte = TT.probe(pos.key(), ttHit);
-    pos.undo_move(pv[0]);
 
     if (ttHit)
     {
         Move m = tte->move(); // Local copy to be SMP safe
         if (MoveList<LEGAL>(pos).contains(m))
-           return pv.push_back(m), true;
+            pv.push_back(m);
     }
 
-    return false;
+    pos.undo_move(pv[0]);
+    return pv.size() > 1;
 }
 
 void Tablebases::filter_root_moves(Position& pos, Search::RootMoves& rootMoves) {