 In particular, Riker bases his primary examination and discussion of game theory to zero-sum situations involving three-or-more-person games (more easily known as n-player or, as Riker calls it, n-person games).He justifies this on the grounds that in n-person games the main activity of the players is to select not only strategies, but partners.Compared to one or two person games where maximum gain is the only thing sought, n-person games involve the potential for parallelism of interests.