It is a game which beat you every chance it is receiving.
One belonging to the easiest and well-loved games is Blackjack. For example: WR of 20xB means how the gross total bet that is at least 20 times the bonus amount end up being wagered. https://hocvienboardgame.net/tin-tuc/choi-lo-de-tai-rikvip-trai-nghiem-thu-vi/