Pridu
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This is all speculation in the style of "what if, maybe, or maybe not." You won't actually catch anyone red-handed, you'll just distract people.
How will you distract people if you're going to review suspicious save files after the game?
You want to click the mouse and figure out if the opponent exactly repeated their turn after disconnecting? Then you only have one option: play against a streamer's player. :-)
In all other cases, you'll have to check and "suspect."