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Generally, a misclick isn't a reason for an autosave, I think everyone understands that, so the right to grant an autosave still rests with the opponent. I would grant an autosave without any problems if it's an obvious misclick (i.e., it's clear that a reasonable person wouldn't intentionally make that move). Also, the issue of an autosave should be resolved immediately at the moment of the misclick, i.e., either we continue playing and accept it, or we immediately grant the autosave. The option of finishing the game and then figuring it out is nonsense.