Chess as a metaphor for anything can be a heavy-handed cliche, but this is Nabokov, so you know he'll make it work. An outcast child who finds solace, and eventually great success, in chess rises through the ranks before suffering a mental breakdown when his intricate defense falters in an important match. Vowing to give up the game, he soon begins seeing life as one large chess game, consisting of repetitive "moves" from which he can't escape.