What is a weak pawn? A pawn that is exposed to attack and also difficult to defend is a weak pawn. There are several varieties: isolated, doubled, too advanced, retarded.

Tartakower once wrote that after planting a Knight in the center you can go to sleep. This is not to be taken literally, of course, but it contains more than a germ of truth.

Chess sharpens the mind, stimulates concentration, improves the memory and promotes visualization.

My style is somewhere between that of Tal and Petrosian

It often happens that a player is so fond of his advantageous position that he is reluctant to transpose to a winning endgame.

Good players develop a tactical instinct, a sense of what is possible or likely and what is not worth calculating.

No matter how much theory progresses, how radically styles change, chess play is inconceivable without tactics.