Originally Posted by ScottyLove
I'm hoping this is the correct answer and makes the most sense... sort of.
I saw a big change in a tournament I played in early April between the unofficial and official ratings.
In between Unofficial and Official round reporting, players who's round scores are >100 points below their rating are thrown out for purposes of determining the SSA (which is determined using linear regression). So the SSA will typically creep up very slightly between Unofficial and Official round reporting, having the effect of both increasing round ratings and decreasing the interval of rating-points-per-throw-difference. Does that help?