Rxc6 bxc6 33. White started a minority attack by 20. b4 . The aim was to use open files on the Queenside. Botvinnik played 17. Rxf5, opening diagonals and files.
Chessmen have to be at the right place at the right time in a strategic plan.
A concerted action of pieces in a specific direction is essential. Attack on the Queenside. Attack on the Kingside. Rxa3 0-0 . Black has aimed at placing pieces at central squares, and hence chose for strategy instead of tactics.