During the pandemic, there has been an explosion of people playing games online. While that has been enjoyable for friendly games, problems can arise when it comes to serious tournaments that can influence the rankings that players have.
In the case of chess, the website chess.com is widely used. The main problem with cheating in chess arises because there are now very powerful chess engines that can rapidly analyze situations and suggest the best move. These engines are used by players to practice their game and by analysts at tournaments who report on games. In face-to-face contests, the use of such engines is not allowed while play is going on but when people are online, it becomes hard to monitor whether someone is having an engine running simultaneously to guide them. The only way to detect such cheating is statistical, to see if the quality of the moves made by a player lie outside the range that one might expect of someone with their ranking.
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