 Complete the following phrase:  Mikhail Botvinnik was the first truly domit Soviet grandmaster, having been groomed for the role due to his youth and loyalty to communism. In 1937, he won the USSR Championship, but the world championship had to wait for over a decade until after WWII had ended and current champion Alexander Alekhine had died in 1946, leaving the championship vacant. Botvinnik became world champion by winning a tournament of five top players, the 