Koltanowski thereafter toured the United States tirelessly for years, running chess tournaments and giving simultaneous exhibitions everywhere. After his failure in the 1946 U.S. Open in Pittsburgh, he never played tournament chess again, except for two games as a member of the U.S. team in the 10th Chess Olympiad (Helsinki 1952), getting a draw with Soviet Grandmaster Alexander Kotov, one of the strongest players in the world, and a draw with Hungarian International Master Tibor Florian, in a game which Koltanowski appeared to be winning.