Cheating in chess can take many forms and has existed almost as long as the game itself. The advent of computers has introduced\r\na new form of cheating into the game. Thanks to the computational power of modern-day computers, a player can use a program\r\nto calculate thousands of moves for him or her, and determine the best possible scenario for each move and countermove. These\r\nprograms are often referred to as ââ?¬Å?bots,ââ?¬Â and can even play the game without any user interaction. In this paper, we describe\r\na methodology aimed at preventing bots from participating in online chess games. The proposed approach is based on the\r\nintegration of a CAPTCHA protocol into a game scenario, and the subsequent inability of bots to accurately track the game\r\nstates. This is achieved by rotating the images of the individual chess pieces and adjusting their resolution in an attempt to render\r\nthem unreadable by a bot. Feedback from users during testing shows that there is minimal impact on their ability to play the game.\r\nPlayers rated the difficulty of reading the pieces on a scale of one to ten, with an average rank of 6.5. However, the average number\r\nof moves to adjust to the distorted pieces was only 3.75. This tells us that, although it is difficult to read the pieces at first, it is easy\r\nto adjust quickly to the new image.
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