Cheating just three times massively ups the chance of winning at chess

Last updated: January 17, 2026 8:15 pm

A recent study conducted by Daniel Keren at the University of Haifa in Israel has shed light on the impact of cheating in chess games. The analysis revealed that just three strategically placed cheats can significantly tilt the odds in favor of a player, even in an otherwise evenly matched game. Surprisingly, systems designed to detect cheating may not always be able to identify these illicit tactics.

Keren simulated 100,000 matches using the Stockfish chess engine, a powerful computer system known for its superior chess-playing abilities. The matches were played between two computer engines operating at the level of an average chess player. In half of the games, no intervention was allowed, while in the other half, occasional assistance from a stronger computer player with an Elo rating of 3190 was permitted.

According to the findings, utilizing a computer chess engine like Stockfish for advice on just one move during the game could increase the player’s chance of winning from 51% to 66% on average. If the player cheats by seeking advice three times during the game, their chances of victory skyrocket to 84%. This significant boost in winning probability highlights the impact of cheating in chess.

Keren emphasized the timing of cheating as a crucial factor. A well-timed intervention from a powerful chess engine at a strategic point in the game could lead to a substantial increase in the player’s chance of winning. The study also implemented a cheating system that became more stringent as the game progressed, making it harder to detect the illicit tactics.

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While Keren’s research is not intended to promote cheating, it underscores the importance of understanding the risks associated with deceptive practices in chess. The study aims to assist chess platforms in developing effective measures to combat cheating and protect the integrity of the game.

Kim Schu from the University of Mainz commended the study for its insights into the complexities of cheating in chess. He emphasized the need for a comprehensive anti-cheating approach that considers multiple signals, including behavioral patterns and move timing.

As the chess community increasingly shifts towards online play, the detection of cheating becomes paramount. Schu suggested a holistic approach that combines various indicators to identify instances of cheating and maintain fair gameplay standards.

Overall, Keren’s study serves as a wake-up call for the chess community to address the challenges posed by cheating and uphold the principles of fair play in the game.