If you will "definitely" become a winner, it's not gambling. As long as you are gambling, there is no promise that you will profit, regardless of your strategy. Also, as lotteries go, there is no strategy involved. It's nothing more than luck, and certainly not definite.
some people just give names to the luck they have had with some method they used. then they call it the winning strategy and stick to it. there is no definitely in gambling.
everything is just depending on luck.