The trick, Crowe says, is discipline. Get a group of people to hold every seat at a blackjack table. The first chair and the last chair make all the calls, and everybody in between just sits on 12 and above. Then you watch the math come your way. Casinos catch on fast and try to break it up by dropping a stranger into the middle of your group. But when it works, it works. Crowe says his crew ran Tom’s system as a team and took $25,000 or more of…