Move by nature

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Fig. 1: A game beginning with a move by nature

In game theory a move by nature is a decision or move in an extensive form game made by a player who has no strategic interests in the outcome. The effect is to add a player, 'Nature', whose practical role is to act as a random number generator. For instance, if a game of Poker requires a dealer to choose which cards a player is dealt, the dealer plays the role of the Nature player.

Fig. 1 shows a signaling game which begins with a move by nature. Moves by nature are an integral part of games of incomplete information.


  • Fudenberg, Drew; Tirole, Jean (1995). Game Theory. MIT Press. pp. 336–337. ISBN 0-262-06141-4.