"When one of us first plays chess, he is like a man who has already caught a dose of microbes of, say, Hong Kong flu. Such a man walks along the street, and he does not yet know that he is ill. He is healthy, he feels fine, but the microbes are doing their work...Suddenly you involuntarily begin to sense that, without chess, there is something missing in your life. Then you may rejoice: you belong to that group of people without a natural immunity to the chess disease." Mikhail Tal