Wisdom of C.J.S. Purdy

A player can get along quite well without knowing the Giuoco Piano;
but if he doesn't know Lucena's position, he won't go far.

C.J.S. Purdy's, Fine Art of Chess Annotation and Other Thoughts, Vol. 2 (Page 45)


Links: 
C.J.S. Purdy   
Lucena position
Giuoco Piano