When I look up prior game stats I always notice this number under people's gamercard.  It says it is "Player Skill".  I was just wondering where this number comes from?

I know it's not TS, but what is it? Why is mine [ http://www.halowars.com/stats/StatsPlayer.aspx?id=23F06A5F6C1044ADB3DC4C76131F238AFB4CCAA733FAFC4E6B34E9FE62D32BED ]

higher than his [ http://www.halowars.com/stats/StatsPlayer.aspx?id=020CD8817D8D969BFF031356182EC6E525FCEDFE45725F3F887CE4837F57A2DC ]?

 Anyone know?