Mouse clicking, typing obscenities when hit with a bad beat, punching the desk, getting a drink during a quick break....
But seriously the ability to handle the physical exertion of a tournament that goes 8hours, lots of mental preparation obviously, if you are taking it seriously.
And more...
The best way to be entirely confident is speak to live support on their site and get them to tell you exactly what to do. Then you can feel safe and have an exact log of the conversation
"I just placed a 1,100 bet at http://www.mansion.com/?trackid=107058 on the
Steelers to cover the 5 point spread on Thursday. If I win I get 1k. If I lose,
Mansion is going to refund my money.
I verified it with live support before I placed the bet. They did a risk free
bet a while back with...