A 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 ShamkovichLack of proper endgame technique allows many players to escape from lost positions, even without any spectacular play on their part.
Leonid ShamkovichObjectivity and presence of mind are essential in such positions where sacrificial temptations are not always resistable.
Leonid Shamkovich