They sat, they surveyed, and …

From Shannon’s 1950 paper [pdf] on programming a chess-playing computer-

… this approximate evaluation f(P) has a more or less continuous range of possible values, while with an exact evaluation there are only three possible values. This is as it should be. In practical play a position may be an “easy win” if a player is, for example, a queen ahead, or a very difficult win with only a pawn advantage. The unlimited intellect assumed in the theory of games, on the other hand, never make a mistake and a smallest winning advantage is as good as mate in one. A game between two such mental giants, Mr. A and Mr. B, would proceed as follows. They sit down at the chessboard, draw the colours, and then survey the pieces for a moment. Then either:-
(1) Mr. A says, “I resign” or
(2) Mr. B says, “I resign” or
(3) Mr. A says, “I offer a draw,” and Mr. B replies, “I accept.”

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