Just make the right estimation of your own strengths and weaknesses, and also that of your opponent.
Anatoly KarpovBut how difficult it can be to gain the desired full point against an opponent of inferior strength, when this is demanded by the tournament position!
Anatoly KarpovIf the opponent offers keen play I don't object; but in such cases I get less satisfaction, even if I win, than from a game conducted according to all the rules of strategy with its ruthless logic.
Anatoly Karpov