Game 246 in Philip W. Sergeant’s Morphy’s Games of Chess (1916), printed pages 301. Commentary from this edition; named earlier annotators remain credited in the notes.

1. 4…Bc5 Now the game is no longer a Two Knights’ Defence, but a form of the Giuoco Piano or Four Knights.
2. 5…h6 No improvement on the normal P—Q3.
3. 10.O-O If 10 Kt×P, Kt—Q5; 11 Q—Q1, B—B3. But P—KR3 was correct. Now Black gets a tremendous attack.
4. 16…Ne5 Reducing White to desperation.