Gambling is a very risky , you must be able to control your emotions.Emotions which makes us to gamble with greed or double your last bet  with fear as known martingale strategy.   Games where skills are important not luck,for example blackjack..You just need to  know when click to hit/stand button.That's why I dont gamble with roulette,dice and others luck based games. Blackjack  gives you opportunity if you are skilled gambler.  For all skill based games  same things  will be there in all that kind of  games. There is a difference between skill and luck based games...