Memorize opening variations, endgame techniques, combinations, ideas, even whole games if you can, but not rules and dogma.

You need not play well - just help your opponent to play badly.

A crisis is a terrible thing to waste.

Do grown men always have to play games? Does everything have to be an excuse for another kind of game? Do any men grow up or do they only come of age?

Thinking is the hardest work there is, which is probably the reason why so few engage in it.