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  Given any payoff matrix, the standard assumption is that the players choose their strategies simultaneously (in any event, that each player must choose a strategy in ignorance of the strategic choice of the other player — or, as described in the original handouts, by “secret ballot”) and without preplay communication. 
  For simplicity, suppose the payoff matrix is 2 × 2, i.e., there are two just two players, each with a choice between two strategies, so the game has just four possible outcomes (cells in the matrix). 
  And suppose that the payoff matrix is common knowledge to each player, i.e., each player knows what the other player’s payoffs (interests/preferences/values are). 
 userpages.umbc.edu /~nmiller/POLI388/VARIATIONS.htm (685 words) 
