Hello, Brief note on the use of ELO.  I do believe that it is only 2 player. However, the one game I am familiar with that uses it is Scrabble on Facebook for up to four players.  In this case they consider a four player game a series of two ways versus the winner.  So winner gets three wins and each 'loser' loses one game.  ELO is good because you get credit for beating a really good player.
Cheers,
I.O.W.A.