Are you one of those people who want to know what is over under blackjack and how does the card count works in Blackjack? You are on the right pace, as in this blackjack guide that’s exactly what we will be talking about.

So, what is Over Under Blackjack?

A long time ago in a casino which is very far away, across seven oceans and seven mountains, there was a casino blackjack side bet called “Over/Under 13” which was marked with OU13. This game gives the current blackjack player the chance to bet that his two cards that will be dealt by the dealer will be over 13 or under 13. This is an interesting bet where you have a slightly less than 50% chance of winning double of what you’ve wagered, and that’s similar to the Roulette wheel regarding percentage wise (if you bet on the colours), as there is one green field on the roulette wheel that doesn’t pay for any of the colours. If your hand card combination is 13, you will lose either way – even if you bet under or over.

OU13 was first offered at Caesar’s Tahoe in 1989 and became very popular by the early 1990’s. By the time people started looking at advantage play against side bets, OU13 was already long gone. After a long time out of the league and hiding in the shades, the OU13 was finally back in some casinos overseas and that’s what we were hoping to see.

Although it was offered on a game that used a continuous shuffler (hence safe), the very fact that it still exists is reason enough to consider it. If it exists, a casino somewhere will find a way to screw it up.

Arnold Snyder is one of the most famous mathematicians that managed to work with the game and explain how it works in details, as well as take advantage of the play of OU13.

Arnold does a great deal of analytics in many of his articles, for the purpose of explaining the blackjack as a game, as well as the Over Under 13 feature to all the players who want to play this feature. We will refer to his article to explain the mathematical approach to the whole feature, and just so you know, he talks about EOR’s and he is proposing six different card counting systems, as that’s what happens when you are about to play this feature, and that’s what you are about to do.

The Over-Under Rule

The rule of Over Under started around 1989 year and it appeared only in one U.S. casino where at the time of the re-appearance, it was in Nevada, Las Vegas (who knew).

Caesars has a two-year exclusive contract with the developer of this rule variation to offer this game in the U.S. In the summer of 1990, the developer may market this rule variation to other U.S. casinos.

Technically, the “rule” of a game cannot be protected by copyright or patent. However, the over-under bet requires an alteration of the blackjack table layout in order to facilitate the side bet. The developer, Mr Ken Perrie, a Caesars’ pit boss, owns the rights to the design of his unique table layout, so if you want this to be featured in some of your games, now you know which guy to contact.

Bets on the regular blackjack hand are placed in the large central circle which is the normal betting spot. Optional over underside bets may be placed in the small circles to the left and right of the centre circle. You won’t miss the bets as they are labelled.

How The Over Under Bet Works?

The over-under bet works pretty similarly to the regular bet. The first thing to remember when playing this bet, and we think it’s obvious, is to place the bet before the dealing starts. The type of bet is optional, meaning you are not obliged to place an over and under bet, but you can choose whether you want to place this bet or not.

There are two circles with name tags on them – Over and Under. If you are placing your bet in the over a circle, you bet for your first two dealt cards to be over 13 and if you are placing your bet in the under, you want your first two cards to be under 13.

These bets are even money bets, and there are several things to keep in mind when playing them. The Ace will always count as One in the over and under bets, while the 10, Jack, King and Queen will all count as 10. The other cards are exactly as they are valued.

If you manage to land exactly 13 in your first cards by 10 + 3 or whatever combination, you will lose the bet even if you’ve bet on over or under.

Over-Under Restrictions

Since the over and under bet is a side bet and it’s up to the player if he wants to play on it, you can’t place it alone without betting the regular blackjack hand. Also, the amount that you bet the over and under bet can’t surpass the amount that you’ve bet on the standard blackjack game. At the Caesars Tahoe, no side bet including over and under can ever exceed £100!


We hope that this article brought a new knowledge to you and widen your overall blackjack information that you have. We tent to answer some of the most frequently asked questions like “What is over under blackjack”, how to play it and we included some information from the expert in the counting cards and betting with the over and under feature, Arnold Snyder.

If you have anything else to add, please use our email to reach us or if you have a desire to try what you’ve learned, follow the links on the right-hand side of this article.