Complete the following sentence: Koltanowski thereafter toured the United States tirelessly for years, running chess tournaments and giving simultaneous exhibitions everywhere. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️
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.