Fix another crash triggered by previous patch

It is ok to redirect st pointer to startState, but the latter
should be updated with the content pointed by the st of the
original position. The bug is hidden when startState and *st
are the same as is the case of searching from start position,
but as soon as moves are made (as is the case when splitting)
the bug leads to a crash.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

diff --git a/src/position.cpp b/src/position.cpp
index bf8497cf90f79310f2a0f5e6a1c67cecbdd18cc9..66890a5f5e2224473d81f4a20d6ab3b8b0937814 100644 (file)
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -100,6 +100,7 @@ CheckInfo::CheckInfo(const Position& pos) {
 void Position::copy(const Position& pos, int th) {
 
   memcpy(this, &pos, sizeof(Position));
+  startState = *st;
   st = &startState;
   threadID = th;
   nodes = 0;