Think of it as a three legged stool. For something to be defined as gambling, all three elements above must exist. On two legs, the stool falls, making it not defined as gambling. In skill gaming, the argument is made that the element of "chance" is removed. This would apply to games similar to Unreal Tournament, PGA Links Golf, Battlefield, etc. The payment scheme is devised similar to poker, where players place their wagers, a fee is deducted from the pot as an administration fee and the players play for the pot itself.