Chess opening position.

The Shannon number, named after Claude Elwood Shannon, is equal to \(10^{120}\), and is an estimate of the game complexity of chess. It is approximately equal to the number of possible 40 move (80 ply) games, 40 moves being an estimate of the average length of of a chess game. It is neither the number of possible positions (estimated to be between \(10^{43}\) and \(10^{45}\)) nor the number of possible games.

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