Positional games

Avoider-Enforcer game

An Avoider-Enforcer game (also called Avoider-Forcer game or Antimaker-Antibreaker game) is a kind of positional game. Like most positional games, it is described by a set of positions/points/elements and a family of subsets, which are called here the losing-sets. It is played by two players, called Avoider and Enforcer, who take turns picking elements until all elements are taken. Avoider wins if he manages to avoid taking a losing set; Enforcer wins if he manages to make Avoider take a losing set. A classic example of such a game is Sim. There, the positions are all the edges of the complete graph on 6 vertices. Players take turns to shade a line in their color, and lose when they form a full triangle of their own color: the losing sets are all the triangles. (Wikipedia).

Avoider-Enforcer game
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Related pages

Positional game | Biased positional game | Family of sets | Maker-Breaker game | Sim (pencil game)