I don't know; I don't want to judge, but the thing is, there is no such thing as "sure" in gambling or sports betting. I assume that you are offering predictions about matches, but what kind of match? sports? or anything else? because if it's about sports betting like the NBA or any sports match prediction, then I will not believe that there is such a "sure prediction," because in sports there is no definite prediction of which team will win. Remember, sports involve people, and during the match, unpredictable things can happen, so I don't believe that there is such a sure win. I don't know, I'm not sure, because I bet in sports betting's maybe you rely on the team's statistics or what, but we never know what will happen inside the court or during the match.

Well, it's good that you offer a period of days so that they can observe your predictions.