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"Highest" level of illegal move

Examples of illegal castling are fairly common. See for example: https://www.chess.com/article/view/do-grandmasters-know-the-rules-of-chess
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"Highest" level of illegal move

Another illegal move was made by in a game Zagrebelny Sergey vs Kayumov Dmitry [Title "Zagrebelny Sergey vs Kayumov Dmitry (1992)"] [fen ""] 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 ...
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"Highest" level of illegal move

Garry Kasparov (who else?) pushed a pawn to the 8th rank in time trouble against Karpov and pressed the clock without replacing the pawn with a queen. Karpov eventually lost on time in a losing ...
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