The knight of QB3 is under obligation, the moment the enemy gives him the chance, of undertaking an invasion of the center by Kn-Q5.
Aron NimzowitschChess strategy as such today is still in its diapers, despite Tarrasch's statement 'We live today in a beautiful time of progress in all fields'. Not even the slightest attempt has been made to explore and formulate the laws of chess strategy.
Aron NimzowitschIn the middlegame, the king is merely an extra, but in the endgame, he is one of the star actors.
Aron Nimzowitsch