With the Nazi invasion of the Soviet Union on June 22, 1941, Estonia came under German control soon afterwards. During 1942 and 1943, Keres and Alekhine both played in four tournaments organized by Ehrhardt Post, a President of Nazi "Grossdeutscher Schachbund". Alekhine won at the Salzburg 1942 chess tournament (Six Grandmasters' Tournament) in June 1942, at Munich (European Individual Chess Championship) in September 1942, and at Prague (International Tournament) in April 1943, always ahead of Keres, who placed second in all three of those tournaments. They tied for first at Salzburg (Six Grandmasters' Tournament) in June 1943, with 7½/10.