Morphy at the odds of his Queen's Knight against Mr. Perrin — an Evans's Gambit decided by an ingenious Rook sacrifice. Notes by Löwenthal.
15.Rxd4An ingenious sacrifice, which gives White a good attack upon the enemy's exposed King. The diagram represents the position previous to White's 15th move:—
18…Bd7Better than taking Knight with Rook.
20.Rxd2A move evincing much judgment and forethought. If White had captured the Knight with his Queen, Black would have exchanged Queens and maintained his Bishop, which is now impossible.
22…b6Had Black moved B. to R's 4th, White would have answered with B. to K's 6th, winning.
J. Löwenthal, Morphy's Games of Chess (1860) · Public domain · source