This week I conclude my homage to the great Estonian grandmaster Paul Keres, who was born a century ago this month. The game I have selected to round off my tribute is an incendiary victory against the red czar of Soviet chess, Mikhail Botvinnik. In their earlier clashes Botvinnik reeled off a series of wins, and by the mid-1950s the Soviet world champion led by seven to one in terms of decisive games.