Field guide

Wheel Bias Exploitation

How it works

Identifying and betting on roulette wheels that have physical imperfections causing certain numbers or sectors to hit more frequently than statistical probability predicts. Teams record thousands of spins, analyzing results for statistical anomalies. A wheel with a slight tilt, worn pocket, or imbalanced rotor may favor specific numbers. Players bet heavily on the biased sector when the favorable conditions are present.

On the record

Joseph Jagger famously broke the bank at Monte Carlo in 1873 by identifying biased wheels. Modern wheels are much more precise, but bias still occurs and is exploited by professional teams.

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.