From 995ccd2f51d32415d5ef6a674554ffb7fc5125d5 Mon Sep 17 00:00:00 2001
From: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
Date: Tue, 15 Nov 2016 22:03:15 +0100
Subject: [PATCH] Fix a crash issue when traversing PVs.

---
 src/main.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/main.cpp b/src/main.cpp
index de220eec..76aca51d 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -119,7 +119,9 @@ void HashProbeImpl::ProbeMove(Position* pos, std::deque<StateInfo>* setup_states
 		// Follow the PV until we hit an illegal move.
 		std::stack<Move> pv;
 		std::set<Key> seen;
-		while (found && is_ok(entry->move())) {
+		while (found && is_ok(entry->move()) &&
+		       pos->pseudo_legal(entry->move()) &&
+		       pos->legal(entry->move())) {
 			FillMove(entry->move(), response->add_pv());
 			if (seen.count(pos->key())) break;
 			pv.push(entry->move());
-- 
2.39.2