Online Blackjack Casino Rules

Hi-Lo Strategy

If you know the Hi-Lo Lite indices, you may use the Hi-Lo strategy changes with the over/ under count for strategy plays on your blackjack hand. In a 6-deck game, with 75% penetration, you could get close to a 1 % advantage by using a 1 to 4 spread with proper over/under bets. With deeper penetration, the value skyrockets.
In some European casinos, there is an over/under variation in which a pair of aces pays a 7 to 1 bonus on under bets. This payout almost doubles the value of the over/under option. Unfortunately, there are very few over/ under games anymore, and the casinos know that card counters attack them.
Most casinos that offer the over/under bet limit the amount that can be bet on this option. In many cases, this bet limitation, in conjunction with generally poor penetration, makes the over/under bet pretty worthless.
By the way, do not place over/under bets without using a card counting system. The house advantage is 6 1/2% on the over bet, and more than 10% on the under, if you're just guessing.

Royal Match

This side bet offered in some single-deck games allows you to wager on whether you will be dealt two cards of the same suit. If so, you will be paid 3 to 1; if you are dealt a king and queen of the same suit, you will be paid 10 to 1.
A card counter developed a system for beating this rule a few years ago, which he sold privately for a few months, then took off the market. I examined the system, and also had the theory tested via computer simulation, and it worked! Unfortunately, it was not an easy card counting system, as you had to keep four separate counts of the cards remaining in each suit. Most blackjack casino that offer the Royal Match option restrict the maximum bet, usually to $25. This limitation makes it difficult to make much money with this option, except for camouflage as player advantages do not occur very frequently. Since any Royal Match counting system would prove worthless for all normal playing and betting decisions, it will rarely be worth a player's time or effort to attempt to exploit it. And do not bet on this option, except for camouflage, unless you are using a valid suit-counting system, as the house edge is 3.8%.
Some casinos also offer a multiple-deck version of the Royal Match bet where any first two suited cards pay 2 1/2 to 1, and a suited K -Q pays 25 to 1. This is far worse for the player than the single-deck version - with these multi-deck payouts, the house edge goes up to 6.7%, and no suit counting system will beat it.

Super Sevens

This side bet was invented by the same man who invented the overt under bet; essentially, you place a one-dollar side-bet that you will be dealt one, two, or three sevens, with various payouts depending on whether the sevens are suited or unsuited. Technically, card counters can beat this option if they learn to keep a count of the sevens, and the perfect counting system for this option is to count all sevens as -12, and everything else as +1.
The house edge on the Super Sevens option is about 10.8%. This qualifies it as a true sucker bet, one of the worst bets available on a table game, similar to the house edge on the hard ways bets at craps, or the tie bet at baccarat.
I no longer remember the true count at which it makes sense to place a Super Sevens bet, but it does occur occasionally. Even so, I wouldn't waste my time trying to figure it out. The problem is that the option is not worth more than a few cents per hour to a seven-counter, due to that $1 maximum bet restriction.