The proper timing of an attacking plan is a difficult matter which places great strain on a player's nerves. Mastery of this art is required for success in the international arena, but perfect mastery eludes even the very best chessplayers!
Leonid ShamkovichA real sacrifice involves a radical change in the character of a game which cannot be effected without foresight, fantasy, and the willingness to risk.
Leonid Shamkovich