Chess and Madness
Apparently Curt didn't like his position here against Steinitz, because it was his move, and the move he played was leaving the room and never returning.
I believe there is a correlation between chess and madness--as it really is an obsession. Whenever I talk to a chess player who has decided to give up chess I feel a sense of impending doom for them. I can't explain it. I just know it is the end, somehow. Not of their obsession, of course. There is no end to that. So it must just be the end, period, for them. Curt, or in Nabokov's novel, the character "Aleksandr Ivanovich Luzhin" decides that chess is the reason for his declining state and tries to give it up. Chess creeps back into his consiousness, however, and he feels it pulling him in. He tries to find the move that will get him out of the game. He finds that move by throwing himself to his death.