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

Scam #22: Key Card Sequencing (Slug Prediction)

How it works

A variation of shuffle tracking where players identify “key cards” - specific cards whose appearance signals that a favorable slug follows. By memorizing which cards appeared before a high-value slug in the discard tray, the player watches for those key cards to reappear after the shuffle. When key cards are dealt, the player knows the favorable slug is coming and increases bets. This reduces the memory burden of full shuffle tracking to remembering just a few key indicator cards.

Where it appears

Blackjack

On the record

Key card sequencing was developed as a more practical alternative to full shuffle tracking, requiring less memorization while still providing significant edges against predictable shuffles.

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.