Basically all types of gambling depend on luck. Strategy is used to increase the chances of winning, I believe gambling cannot be separated from luck. I prefer to be a lucky person in gambling rather than being a gambling master but far from luck. 
There are people who win at gambling and they do not believe in LUCK. I think that it is more about numbers, probability and math. You are good at tracking the strategies of someone; you can make in mind a counter strategy which helps a lot.It varies from person to person. Some people might achieve a mind state in which they perform extraordinarily for they free themselves of all the worldly thoughts and focus on that problem in that instance.
It is a state of concentration that is difficult to achieve, which affects psychology, trying to repress emotions is what is difficult to control.