I'm guessing blackjack or roulette. For blackjack, he could use the outside accomplice to count cards, then start playing at a table with favorable shoe. For

I'm guessing blackjack or roulette. For blackjack, he could use the outside accomplice to count cards, then start playing at a table with favorable shoe. For roulette, I think I've read elsewhere that precise timing of the spinning wheel allows you to model its physics well enough to figure out where it will land.