Morphy against Eugène Rousseau, New Orleans 1849 — a King's Knight's Opening in which Black's early 3. P. to K. B's 4th invites a vigorous attack. Notes by Löwenthal.

1. 3…f5 An unusual move in this opening, and one not to be recommended.
2. 5…d6 Shutting in the K's B. Black should rather have played B. to Q. B's 4th.
3. 10.Nce4 Mr. Morphy's sacrifices, as we have observed before, are almost always sound. Here, whether the proffered Kt. is taken or not, White's Pieces are rapidly developed without any risk whatever being incurred.