Not exactly 50/50 chance..
Some people uses tactics e.g style switching, which gets them a higher chance of winning.
Defense mode when being hit. Attack mode when hitting
This way you get a +3 def and atk bonus. Watch any pro staker box stake and they all do this
thats true, but you get the odd "mad" guy who box's hes bank and just leaves attack's on punch and sometimes pull it off so really its luck.

