The Immortal Zwischenzug

"The jargon of chess is replete with foreign words and phrases, suggesting the universality of the game. From the German, for example, comes the togue twister "Zwischenzug," a tactic that enjoys a respectable reputation. It means an intermediate or in-between move, and refers to a move interpolated before a necessary or expected move, such as a retaliatory capture, exerting a threat that cannot be ignored. If any game is to be dubbed the "Immortal Zwischenzug," is this one, played in the great Tournament of New York in 1924."

(Al Horowitz)