They use phones to record video of a vulnerable machine in action, then transmit the footage to an office in St. Petersburg. There, Alex and his assistants analyze the video to determine when the games’ odds will briefly tilt against the house. They then send timing data to a custom app on an agent’s phone; this data causes the phones to vibrate a split second before the agent should press the “Spin” button. By using these cues to beat slots in multiple casinos, a four-person team can earn more than $250,000 a week. ... Determined to find a way to score one last payday before shutting down his enterprise, Alex reached out to Aristocrat Leisure, an Australian slot machine manufacturer whose vulnerable products have been his chief targets. ... ideally, a PRNG should approximate the utter unpredictability of radioactive decay.