Morphy mates in Paris, 1858 - the last move marked, the bishop that guards the rook as an arrow.
1The tagchess/opera.padpad
{chess'1n1Rkb1r/p4ppp/4q3/4p1B1/4P3/8/PPP2PPP/2K5 b k - 1 17', highlight='d1, d8', arrow='g5-d8', title='Morphy against the Duke of Brunswick and Count Isouard, Paris 1858: 17.Rd8 mate'}