Restriction

Restriction is the positional discipline of denying the opponent good squares. It was named and developed as a doctrine by Aron Nimzowitsch in My System, where it sits alongside prophylaxis and blockade as one of three closely related ideas about how to play with the position rather than against the position. Where blockade stops a single pawn and prophylaxis prevents a single move, restriction is the larger project of shrinking the opponent’s playing area until they have nowhere useful to go.

The means of restriction are mostly pawn moves. A pawn on the fourth or fifth rank denies the opponent’s pieces the squares in front of it. A chain of pawns on a single colour denies the opponent’s bishop of the same colour any useful diagonal. The Maroczy Bind — White pawns on c4 and e4 against the Sicilian — is the textbook example of restriction at the level of the whole queenside: Black’s pieces have squares to occupy but no breaks to make, and the position can be played for fifty moves with the position never quite opening up.

Restriction is patient. A restricted position is not a winning position; it is a position in which the opponent must find moves of their own volition while their pieces have nowhere to go. Many top games at the highest level are won by restriction alone: the eventual material gain or mating attack comes after the position has already been stripped of opponent counterplay. Anatoly Karpov, Tigran Petrosian, and Magnus Carlsen are the canonical practitioners of the modern restrictive style.

The opposite of restriction is dynamism — the willingness to accept some weakening of one’s own position in exchange for piece activity. The balance between the two defines almost every middlegame plan in modern chess. A player who only restricts plays slowly and loses to active defenders; a player who only seeks activity plays sharply and loses to patient ones. The strongest players judge which mode the position rewards and play accordingly.