If Tal sacrifices a piece, take it. If Petrosian sacrifices a piece, don't take it.
Mikhail BotvinnikWhen my opponent's clock is going I discuss general considerations in an internal dialogue with myself. When my own clock is going I analyse conctrete variations.
Mikhail BotvinnikIt must be clearly understood that Soviet players do not seek simple systems in the opening, but try to formulate opening systems in which everything is complicated, distinctive, or new.
Mikhail BotvinnikYou have to accustom yourself to practical study at home, you have to devote time to studies, to the history of chess, the development of chess theory, of chess culture.
Mikhail Botvinnik