Wonging: counting a shoe before you sit down
Wonging means counting a blackjack shoe while standing behind the table and joining only when the count is good. You leave when it turns bad. It is legal in the US, but casinos can bar mid-shoe entry or ask you to leave.
Reviewed Oct 15, 2026
Answer first
90s- 01Watch first, play only in good counts.
- 02Leave when the true count falls.
- 03Many tables post a no mid-shoe entry sign.
Key numbers
Wonging at a glance
In short
Key takeaways
- You skip most negative hands.
- A shoe game makes it practical.
- No mid-shoe entry rules block it.
- Casinos may back you off even if it is legal.
Progress
A back-counting cycle
- 1
Stand and watch
Count the cards
- 2
Count rises
True count +1 or more
- 3
Join the game
Bet as the count says
- 4
Count drops
Leave the table
- 5
Find a new shoe
Start again
Simple flow; real play is faster.
Running count to true count (6 decks)
| Running count | Decks left | True count | Action |
|---|---|---|---|
| +4 | 4 | +1 | Enter if allowed |
| +8 | 4 | +2 | Enter and raise bets |
| +6 | 2 | +3 | Bet more |
| −3 | 3 | −1 | Leave |
| 0 | 5 | 0 | Keep watching |
True count is running count divided by decks left.
Where the name comes from
Stanford Wong described back-counting in his book Professional Blackjack, first published in 1975. The idea is simple. Rather than play every hand and spread bets, you play only when the remaining cards favor you.
A good count means more 10s and aces remain. That raises your chance of blackjack, which pays 3 to 2, and helps doubles. Each true count point is worth roughly 0.5% in player edge, so at +1 to +2 the edge moves from about −0.5% toward even or slightly positive.
By skipping negative counts, you avoid the hands where the house is strongest. That lets a wonger use a smaller bet spread than a player who sits through every hand.
Wonging vs playing all hands
| Point | Play all | Wonging |
|---|---|---|
| Hands per shoe | All of them | Only good counts |
| Bet spread needed | Wide, like 1 to 12 | Narrower |
| Time at table | Long | Short, in and out |
| Casino attention | Bet changes | Entries and exits |
| Main obstacle | Heat on spreads | No mid-shoe entry |
Our own summary of common practice.
No mid-shoe entry rules
Many casinos put a sign on high-limit and some regular shoe tables that says no mid-shoe entry. You may only join after a shuffle. This rule exists mainly to stop wonging.
Shuffle machines and continuous shufflers also make wonging useless. A continuous shuffler puts used cards back in, so the count never builds up.
Sequence
How players back-count
Step 01
Pick a shoe game
Six or eight decks.
Step 02
Check the sign
No mid-shoe entry?
Step 03
Count from the back
Keep a running count.
Step 04
Enter at a good count
Often +1 or +2.
Step 05
Leave when it drops
Do not stay out of habit.
Is it legal?
In most US states, counting cards in your head is legal. Casinos are private businesses, though. In Nevada they may refuse play to card counters, and in most states they can ask you to leave or only flat bet. New Jersey limits barring, but casinos can still shuffle early.
Using a device to count is illegal in Nevada and many other states.
Floor rules
Counting terms
Know before you sit
- Running count
- Card count since the shuffle.
- True count
- Running count per deck left.
- Wonging
- Joining only in good counts.
- Back-off
- A casino asking you to stop.
Common mistakes
- Entering at a small running count
- Use the true count.
- Ignoring the sign
- You may be refused.
- Staying in bad counts
- Leave when it drops.
- Wonging a CSM
- The count never builds.
Keep reading
Related pages
Go play
Where to play in Las Vegas
Tap a resort — each row opens that casino’s White Gambling page (hours, game mix, floor facts). Venues with this game in official counts, sorted high to low.
Open a casino page
Real listings · not adsAfter the 90 seconds
Questions before and after you play
A 90-second guide cannot cover every table moment. Tap a group, then a question — answers are short paragraphs, not one-liners.
01Basics
What is wonging?
Counting a blackjack shoe from behind the table and joining only when the count favors you, then leaving when it turns bad.
Why is it called wonging?
After Stanford Wong, who wrote about back-counting in Professional Blackjack in 1975.
What count do players enter at?
Often a true count of +1 or +2, depending on rules and their bet plan. House rules can vary, so check the table placard or ask the dealer.
02Rules
Is wonging legal?
Counting in your head is legal in most US states, but casinos can refuse play or ask you to leave.
What is no mid-shoe entry?
A table rule that you can only join after a shuffle. It is aimed at back-counters.
Can I wong online?
Most online blackjack shuffles every hand, so there is no count to watch. House rules can vary, so check the table placard or ask the dealer.
03Practice
Does wonging work with a shuffle machine?
Not with a continuous shuffler, which mixes cards back in. Batch shufflers that deal a full shoe can still be counted.
How much edge can wonging give?
A small one, often around 1% on the hands played, with large swings. House rules can vary, so check the table placard or ask the dealer.
Will casinos notice?
Often. Players who join and leave at key moments draw attention from the floor. House rules can vary, so check the table placard or ask the dealer.
Sources
- Wikipedia — Card counting Not from a registry (Reference source, not an official registry) · accessed Oct 15, 2026Counting systems and back-counting
- Wizard of Odds — Card counting introduction Not from a registry (Reference source, not an official registry)The gaming industry’s standard reference for casino-game math, by actuary Michael Shackleford. Not an official registry; our calculators compute these numbers independently. · accessed Oct 15, 2026Counting basics and true count
- Wizard of Odds — Blackjack Not from a registry (Reference source, not an official registry)The gaming industry’s standard reference for casino-game math, by actuary Michael Shackleford. Not an official registry; our calculators compute these numbers independently. · accessed Oct 15, 2026Rules and house edge
- Nevada Gaming Control Board · accessed Oct 15, 2026Approved games and gaming revenue reports
- National Council on Problem Gambling — Help and resources Not from a registry (Reference source, not an official registry) · accessed Oct 15, 2026Free, confidential help: call or text 1-800-GAMBLER