In his book My System Nimzowitsch put forward the idea of prophylaxis – shutting down the opponent’s counter chances. Nimzowitsch showed many examples to illustrate how important it can be to make a move which suppresses the opponent’s play. In the game below Nigel pointed out that 12. a3 rather than my 12. Rfe1 would have killed most of Black’s Queenside play. While I missed that Nigel said that he saw a lot of good positional play coming through in this game.