Chessmaster1000:

My fourth question is:
I have around 300 completed Backgammon games and 100 Hyper-Backgammon.
When i win or lose against an equal opponent at Backgammon, i gain or lose 8 points ALWAYS! When i win or lose against an equal opponent at Hyper-Backgammon, i gain or lose 19-25 points.......
Why is that happening.............?

If the rating system is implemented the way Mark Glickman devised, there are 2 numbers used to compute your rating. One is your rating, the other is your rating deviation (or just r.d.)

The r.d. measures the accuracy of your rating. It uses the typical Gaussian type distribution associated with a 95% level of uncertainty based on what is known about your play, and the accuracy of your opponents' play.

The higher your r.d., the more your rating will tend to ocillate.

For example, at "game 0", your r.d. is set at 350. This means with a 95% level of certainty, your rating is the starting rating (1500?) + or - 350 points.

Whether you win or lose, your r.d. goes down a bunch, I think to about 220. That means your next rating is +- 220 from your "true" rating with, again, a 95% level of certainty.

As time goes on, your r.d. goes down to about 30, then it hardly ever goes below that.

With your game counts, it is safe to say your r.d. for 300+ games is much lower than for 100+ games.

Also, your r.d. starts to RISE again as you do not play for a while. It is a time-based anti-decay function.

Now, after having said all of that, I hope that is why you are observing what you are observing!