X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fmain.cpp;fp=src%2Fmain.cpp;h=299b4135c8e351fa8be5895cb64d2173ec655484;hp=4be9aaf3fac5727e1db8833d8acbab4d4929275c;hb=0e82bf6495ddefa1bfee158d242a2d58432cee5d;hpb=027ba2704dfbc26e671ca3f0a0db1b01c3becff3

diff --git a/src/main.cpp b/src/main.cpp
index 4be9aaf3..299b4135 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -114,9 +114,12 @@ public:
 
 			// Follow the PV until we hit an illegal move.
 			std::stack<Move> pv;
+			std::set<Key> seen;
 			while (found && is_ok(entry->move())) {
 				FillMove(entry->move(), response->add_pv());
+				if (seen.count(pos->key())) break;
 				pv.push(entry->move());
+				seen.insert(pos->key());
 				setup_states->push(StateInfo());
 				pos->do_move(entry->move(), setup_states->top(), pos->gives_check(entry->move(), CheckInfo(*pos)));
 				entry = TT.probe(pos->key(), found);