There are event you can predict on that even though it's not 💯 guaranteed that you're going to win, a level of certainty makes you think that you're surely going to win.
This is how some people will think and stake their money on a game or bet and lose. They may think that they would win and just lose because they are overconfident
ifof their decisions.
Or maybe you can explain what you mean better and also let us know the kind of bet.
BitBut I have not seen a better that is 100% guaranteed before.