Continuous Shuffling Machines in Blackjack
What a CSM is
A continuous shuffling machine (CSM) is a device that sits at the dealer's position and holds the cards. After each round, the dealer drops the used cards back into the machine, which mixes them in with the rest. The next hand is dealt from the machine, and the shoe is always full.
There is no discard tray building up and no cut card. From the player's side, the game looks like an endless shoe.
Why counting fails
Card counting works because the cards that have left the shoe change the odds for the cards that remain. A CSM wipes that out. The cards you just saw go straight back into the pile, so the deck composition at the start of each hand is close to that of a fresh shoe.
The running count has nothing to tell you. The true count is meaningless, since there is no real "decks remaining." A counter cannot raise bets at the right time because there is no right time. For counters, a CSM game is simply unbeatable.
Effect on a basic strategy player
If you are not counting, a CSM does not change the house edge. Each hand is played from effectively the same shoe, so the same basic strategy chart applies. The deck count still matters, and a CSM that holds 5 or 6 decks plays like a shoe of that size.
What changes is the speed. With no shuffle pause, a CSM table deals more hands per hour than a hand-shuffled shoe. More hands per hour means more bets, and more bets mean more expected loss per hour at the same house edge. If you play for entertainment on a budget, a CSM table drains your bankroll faster at the same bet size.
CSM vs auto shufflers
These get confused, and the difference is important.
- Continuous shuffler (CSM): the cards go back in after every hand. No counting is possible.
- Automatic shuffler: the dealer plays the shoe down to the cut card as normal, and the machine shuffles the next shoe while the current one is being played. Counting works as usual, and the only change is less downtime between shoes.
If a dealer pulls cards from a shoe and places them in a discard tray, it is a normal shoe, even if a machine shuffled it earlier. If the dealer feeds cards back into the machine after each round, that is a CSM. How deep the dealer plays also matters; see deck penetration.
How to spot one
- There is no discard tray with a visible stack of used cards.
- The dealer drops cards into a box on the table after every hand.
- The game moves fast, and the shoe never seems to run out.
What to do
If you only play basic strategy, a CSM is fine from the rules point of view, but be aware of the speed. If you are practicing to count, avoid CSM tables. The trainer has a continuous shuffler preset, which shows what a CSM game looks like when the count never builds up. For more rules that matter, see the rules overview.
Common questions
Does a CSM change the house edge?
Not for a basic strategy player. It removes the counter's ability to gain an edge.
Is it legal for casinos to use CSMs?
Yes. They are a standard piece of equipment.
Can I count a CSM if it is only partly continuous?
Some machines recycle only part of the discards. The count builds slowly, if at all, so it is rarely worth the effort.
Why do casinos like them?
Faster play means more hands per hour, and counters are not a threat.