What Work Now May Not Work Tomorrow pattern do exist but I agree that is going to work everytime. Like your friend i usually do play a mines game i use pattern that bomb usually dont in the same place. It work like 3 times in a 5 games but only work if you setting the bomb 1 and you can only take profit 1 tiles that gives u only 0.04x which is very low.
What's the point? If you are losing 2 bets out of 5, you are losing 2x, and winning 3 bets for 0.04x would only give you 0.12x which means you are losing 1.88x with this pattern. In mines, it can only sometimes be profitable if you go ahead and open quite a few tiles if you open the bomb once. If you manage to open more tiles, it means you will get a higher multiplier than what you have lost just now and that will make it even.
However, at the end of the day, it's gambling, and it won't let you keep winning. Sometimes, you wouldn't be able to open more than 3 tiles, it starts to feel like the bomb moves when you start opening tiles and it moves near the tiles where you are opening and boom, you lose. That's how gambling is, it's a game of chance and your chances of losing are mostly higher than winning.