Matrix 2x2

This is a payout function which has symmetric payoffs. A perfect example of a game which uses this is Prisoner's Dilemma. Each player has the option of picking strategy A or B and the payoff for that will be based off the player's choice and his or her opponent's choice. An selector which works well with Matrix2x2 is Pure. The Pure selector will force the players to only play 'pure' strategies, such as all A or all B. Below is a screenshot of Prisoner's Dilemma, which uses Matrix 2x2, with the pure selector.

For more on the Pure selector, please go to the Pure page.
The payoffs are determined by the fields 'Aa' 'Ab' 'Ba' 'Bb' in the config file. The value under each one determines the payoff if the players are playing those particular strategies. For example, let us discuss two players Frank and Jimmy. If both players play 'a' then they will both be paid the amount under the 'Aa' column. If Frank plays A and Jimmy plays B, then Frank will be paid Ab and Jimmy Ba. This is because each player gets paid by the section of [their strategy][opponent's strategy].

(link to instructions to asymmetric payoffs))