Shannon number

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What Wikipedia says

The Shannon number, named after the American mathematician Claude Shannon, is a conservative lower bound of the game-tree complexity of chess of 10120, based on an average of about 103 possibilities for a pair of moves consisting of a move for White followed by a move for Black, and a typical game lasting about 40 such pairs of moves.

Excerpt from the Wikipedia article “Shannon number”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Jacobs, Konrad, CC BY-SA 2.0 de, via Wikimedia Commons.