Part I: Card Game Cheating · Collusion & Electronic Cheating at Card Games

Scam #16: First-Basing (Basing)

How it works

A player seated at first base (the position immediately to the dealer’s left) exploits sloppy dealer technique when the dealer checks for blackjack. If the dealer lifts the corner of their hole card too high or angles it toward first base while checking under their up-card, a sharp-eyed player can glimpse the card value. This information provides a massive mathematical edge, allowing the player to make perfect playing and doubling decisions. First-basing is most effective against dealers who check hole cards manually rather than using electronic readers.

Where it appears

Blackjack

On the record

First-basing was a staple technique of professional blackjack players for decades before electronic hole card readers became common. Many professional gamblers built careers around identifying and exploiting sloppy dealers. The technique is now less common in modern casinos but still viable in jurisdictions or venues without electronic readers.

Published as a detection reference for surveillance, compliance and gaming-operations professionals. Thresholds and tuning are set by the property. Nothing here is instruction — the method is described so it can be recognised.