![]() Because of its higher house edge, the Under 13 bet is worth less to the card counter than the Over 13 bet. In particular, in a six-deck game, the Over 13 bet has a 6.555% house edge and the Under 13 bet has a 10.067% house edge. Here is the combinatorial analysis for OU13: It seems the casino industry is quick to forget the hard lessons it has learned. It’s hard to understand how a casino anywhere could offer this wager from a shoe given its long documented history of being beaten by APs. Then last week an advantage player (let’s call him “Fred”) wrote to me saying he saw OU13 offered on a six-deck shoe game (somewhere in the world-wide casinosphere). Last August I observed it being offered from a continuous shuffle machine, prompting this blog post. However, like Lazarus, it has been raised from the dead. OU13 first appeared at Caesar’s Tahoe in 1989 and was already long gone by the time I started playing in 1996. In fact, OU13 was one of the first blackjack side bets to be systematically analyzed and beaten by APs. That OU13 is countable is intuitively obvious to the casual observer. ![]() A total of 13 is a loss for both wagers, giving the house edge. The Over/Under 13 (OU13) blackjack side bet is actually two different side bets: the player can wager that his first two cards will total more than 13 (the “Over” bet) or less than 13 (the “Under” bet).
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