Here's the formula for calculating the rating if a player doesn't show up for a tournament but registered:
Rnew=Rold-N\2
where N is the number of games the player missed.
Do you think this is optimal? :)
Let's say my rating is 100, and I missed only 1 game:
100-1\2=99.5 - is this rational in your opinion?
Do you think people will immediately try to attend the game because of a 0.5 rating difference? I think it needs to be more reasonable.