first of all, why would you want to play in a site that already has some negative comments about it like the scam accusation that was linked in a couple of comments above. just try another site, thankfully there is no lack of gambling sites with bitcoin!!

also winning doesn't mean they are or aren't scam. how much are you winning? 1BTC or 100 satoshi? how long have you been playing there 10 minutes or 10 weeks?
and also more importantly how much did you deposit and how much did you withdraw?