Barnes against Morphy — a casual game in Philidor's Defence from the London 1858 offhand series. With the Black pieces Morphy frees his confined Bishop and wins.
4.Nxd4Authors treating of this particular opening have agreed in pronouncing this move a bad one, since it gives Black an opportunity of liberating his K's B. We, however, in an analysis of it, have proved its soundness, for which see "Chess Monthly," vol. ii, pp. 11 and 225.
4…Nf6P. to Q's 4th is the better move here, and the proper line of attack and defence has been given at length elsewhere.
15…d5Very well played, liberating the confined Bishop.
16.Kh1The correct move; for had White advanced P. to K. B's 5th, Black would have attained a fine game.
J. Löwenthal, Morphy's Games of Chess (1860) · Public domain · source