I and many of my friends have our own mantra before and after we gamble, I just discovered this when we have a drinking session we find out that many of us have our own mantra before, while playing and after or even in the middle of playing.
Mine was "This is my lucky day and I'm claiming it" and when in the middle of the game "I need to play money that I can afford to lose".
How about you do you have one and when do you recite it before, while playing or after you gamble.
I am sure everyone before starting their game, their inner say would be, "need to win", "focus", "concentrate","crab the opportunity" and so on. At the same time, if the move is not in favor to us then, "no worries, will take care next time", "no worries, you have done a good job and you tried your best, try to overcome the issues made and so on. I am sure, such positive thoughts and mantra you say, will have an impact towards output. The more confident you are, the more positive you are, the output will be yes very positive.