It's pretty difficult to create what you're asking for without more information. If it's a poker type game, you could make a program to calculate your chances to win. If it's a browser game, you could potentially make an extension for it.
Same thing as wangbarry2 said, need more information if you need help. Depending if it's an app or if it's on a website will determine if you can "always win" or not. If it's a game about luck like poker or any other card game then your out of luck lol. Best you could do like he said is something that tells you your chance of winning and helps you play your cards accordingly.