A projective game with seven players Consider a simple game with seven players, with winning coalitions:
{1, 2, 4},{2, 3, 5},{1, 3, 6},{3, 4, 7},{1, 5, 7},{2, 6, 7},{4, 5, 6},
and every coalition containing at least one of these winning coalitions. The game is presented graphically in the following figure. Each winning coalition must contain three players who are either all along one of the straight lines, or all on the circle.
Prove that this game cannot be represented as a weighted majority game.