Ratings can be very deceptive. For example, when I use to play in OTB tournaments we had notorious "Sandbaggers". Their rating would drop like a stone to get to a certain number, ie; >1800 so they collect the first prize class prize. Seemed like a big effort to me, to collect a couple of hundred dollars and of course lose the respect of your peers.
I guess big invitationals ie; World Open suffer from the same problem, where you have GM's playing for the under 1600 prize.


since FIDE is an international chess federation, I strongly suggest to follow the ELO rating computation in memory of Elo and if anyone knows the formula of elo rating computation please do so.