X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fposition.h;h=fa812effff71584c94db59aad1019f51868ee599;hp=ce526b91430790fe43d58642b79b2f09ac79a8eb;hb=bdeda52efd55c97d0f5da908267c01f973371e5d;hpb=5837228aa0c0fdd4fed6dc76c04d3fbecd096f60;ds=sidebyside

diff --git a/src/position.h b/src/position.h
index ce526b91..fa812eff 100644
--- a/src/position.h
+++ b/src/position.h
@@ -56,7 +56,10 @@ struct StateInfo {
   Bitboard   checkSquares[PIECE_TYPE_NB];
 };
 
-// In a std::deque references to elements are unaffected upon resizing
+/// A list to keep track of the position states along the setup moves (from the
+/// start position to the position just before the search starts). Needed by
+/// 'draw by repetition' detection. Use a std::deque because pointers to
+/// elements are not invalidated upon list resizing.
 typedef std::unique_ptr<std::deque<StateInfo>> StateListPtr;