Why is he not so smart? If you look at his transactions he must be some kind of whale to bet 0.50 BTC just like that. He won over 1 BTC in that bet alone.
Most of the other players are only betting like $5 or $10 at a time but he instead is betting big.
He is a good trader, but he needs to remember never double spend here, oterwise his money will be confiscated. We need to follow the site's rules strictly.