If there is safe methods of gambling, nobody will tell you. If we all know the trick, there will be no casinos.
A trick of this kind may not exist as no secrets can be secrets forever. If there is a casino will quicklu change there system without you knowing it, as casinos won't allow to lose in any given night, they always want you to think that you know the system but you slowly are losing.
No casino would made a secret way or any exploit techniques that could cause their bankruptcy. If someone discovers then they would definitely busted that up as soon as possible because thats already a threat to their business, its like a leak which money drains out came from their site.