This shit’s chess, it ain’t checkers.

Mathematical proofs, like diamonds, are hard as well as clear.

I decry the current tendency to seek patents on algorithms. There are better ways to earn a living than to prevent other people from making use of one’s contributions to computer science.

You’re just like an angel: your skin makes me cry.

I do not think there is any other mental strain comparable to the exertion to which a tournament game subjects the chess master. Working at what seemed to me the most difficult mathematical problems has never exhausted me nearly as much as playing in a chess tournament; and of all intellectual applications mathematical work is surely the hardest. That is why physical fitness is a most important factor in tournament chess and why young players, whose brains can stand the poisons of fatigue much longer than those of older players have a great advantage.