Oh gawd, not the Martingale again. (do not do this. The modern expression is "The market can stay irrational for longer than you can stay liquid") At least a

Oh gawd, not the Martingale again. (do not do this. The modern expression is "The market can stay irrational for longer than you can stay liquid") At least arbitrage across bookies is reasonably safe. And I like the "marriage problem" concept.