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Go to Harvard Square in Cambridge or Washington Square in New York City or any public place where chess players have gathered to watch or challenge each other. If you stand in the midst of the crowd long enough, you will eventually hear someone say, “That’s it!” It might be a soft whisper or a matter-of-fact statement or even an enthusiastic exclamation, but it will be the announcement of a spectator who realizes that the game is over. Even if the soon-to-be-loser doesn’t realize it, the spectator and the soon-to-be-winner know that the decisive move has been made and the outcome assured.