Its how you play your cards. E.G my staratagy if to do as much damage with high level cards as i can in the first turn and then use damage reducers to stop my opponents damage or my strategy is to use damage reducers to ko my opponent because they won't expect that.
Everything is chance my friend
Reverse psychology depends on 50-50 luck. Even more so since you're playing against someone you have never met before. Which means that you don't understand him. If you play against your kid brother you may win 9 times out of 10 even if his deck is better because you understand him and thus his strategy well.