The game was probably UNRATED. meaning no matter who wins and who loses neither rating will change as a result of the game.
Rating

Play people who are rated about 50 pts higher than you, they are not that much better but they think they are and theyll end up loosing to you. =)
I just won against someone with a 1370 rating. Mine was 1258 at the start and after I won the game there was no change. I have played approx 160 games and he has played over 400, why no change in my rating after the win?
Thanks Clarkbar