I put this on another thread but i will put it on this one as well the bottom line you win 90 credits but only gain 80 credits for 100 credit match.
Here is the breakdown when playing For 100 credits and winning
You bet 100 credits- 10% fee=90
Other player bet 100 credits-10% fee =90
90+90=180 You started with 100 credits so you would gain 80 credits.