I did not understand how a gambler can be sure before gambling that he will win. If this could be confirmed in advance, then no gambler would have lost money or someone who knew this would have invested all his money in gambling and would have borrowed money from his neighbors or relatives and gambled. From what I understand about gambling, I can at least say that in the case of gambling, nothing can be said for sure in advance about the outcome. Maybe a gambler can make a prediction about the outcome of a gambling game through his skills and experience, but no one can give a guarantee that that prediction will be 100% true.

Similarly, when a gambler bets, there will be two opponents in the case of betting, but that gambler will definitely bet on one opponent's site and the opponent is stronger. When betting on a site with a strong opponent, he will feel that his chances of winning are high, but he will never feel that he will definitely win.