Chess is a game by its form, an art by its content and a science by the difficulty of gaining mastery in it. Chess can convey as much happiness as a good book or work of music can. However, it is necessary to learn to play well and only afterwards will one experience real delight.
As quoted in: Наука и жизнь (1963), p. 98: "Шахматы — это по форме игра, по содержанию..."