In order to maintain the fairness of the games, outcomes at online casinos are totally random. With the casino not knowing the winnings of individual users at any given time, the games remain safe, and beyond the influence of third-parties. As to the chances of winning, you cannot be certain, but you can influence the result of a game by choosing one with specific volatility and return to player (RTP) rates. With a game of low volatility, you will win often but with lower payouts. Medium volatility games will win in a more steady way, with better sums. High volatility games give fewer payouts, but when you do win, it will be a higher amount. The higher the RTP the greater the percentage of the funds played by the player are being paid back. Volatility information can usually be found in the game developer's website. RTP can be viewed at the casino website itself.