Morphy against Löwenthal, New Orleans, May 1850 — played when Morphy was twelve years old, during Löwenthal's visit to the city; a Sicilian won by the boy. Notes by Löwenthal.
9…cxd4This is an injudicious move, as it must cost Black his Q's P.
17.f5Well-timed, and threatening to become very troublesome to Black by advancing to the 6th.
17…Qh4Hastily played; P. to K. B's 3rd is much better.
22.Qh5Exceedingly well played, threatening to win Black's Kt., and acquiring a splendid attack.
23.Bxh7+Let the reader consider that all this was played by a mere child.
23…Kf8Had Black taken B. with Q., White would have replied with Kt. to K's 7th (ch.), and then Q. takes Kt., &c., winning a clear piece.
28…Qxg2+K. R. takes Kt. might have been better. All the latter moves of the game are played by the young Morphy with remarkable accuracy.
J. Löwenthal, Morphy's Games of Chess (1860) · Public domain · source