Originally posted by BrainDrain
it happened now for the third time in a row.i checkmated my opponent and my rating went down to 1470.this cant be normal
It IS normal, because the people you are beating are either:
1. More than 400 points below you, or
2. More than 200 points below you and also provisional.
Basically the system is not prepared to give you much credit for beating someone ranked that low. Even if you weren't provisional you'd only get 1 or 2 points for these wins.
The changes will be less dramatic as the number of games you play increases, but until you have 20 games under your belt this will continue to happen when you beat people ranked a lot lower than you.
If you lose to someone more than 400 points ABOVE you, then you rating will go up at the moment, so it works both ways.