Back-Counting

Detailed Explanation

Back-counting (also known as 'Wonging', named after author Stanford Wong) is an advantage play technique where a player stands near a blackjack table, counts the cards being played without participating, and sits down to play only when the running count rises to a level where the player has a positive expected value.

The advantage of back-counting over flat-counting (counting while always playing) is that the counter never plays negative-EV hands — every hand played is at a positive count. This dramatically improves the overall expected return per hour compared to playing through negative shoes. The disadvantage is visibility: casino staff recognise that a player who consistently appears only at high counts is likely back-counting.

Most casinos now post 'No Mid-Shoe Entry' rules at tables specifically to counter back-counting. These signs prohibit players from joining a game after the first deal has begun. Some casinos extend this to require players join only at the start of a new shoe. Despite these countermeasures, back-counting opportunities persist in high-traffic casinos where staff are distracted, in games with fewer decks, and on tables with irregular shoe progress monitoring.