It depends what kind of game they are playing. If they play about dice, then luck is the only way to win the game but in cards it needs skills to win the game. Strong feeling is similar to say that we/you will be lucky within that day IMO.
I have friends who are into cockfighting and these guys are really relying their luck on what they wear, some signs, and the like. Maybe positive thinking can help with that but to be honest, in the games based on luck, there no much you can do about it no how much positive you are talking about the situation, the same will not affect it!