Explanations of this phenomenon
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Loud and clear?
I think there's an 80% chance he's running absurdly good, a 10% chance something is up, and a 10% chance he's running weak/tight players over and actually beating the game.
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Although I'm sure you realize this, it's probably worth emphasizing that the first and third possibilities are not mutually exclusive. From my reading of your statement, you feel 80% confident that not only is his win rate unsustainable, but that he can't beat the game in the long run.
An interesting thing is that, even if he can't beat the game, the expected time it would take for his winrate to reach 0 is probably so long that he could go a very long time believing he is a winner. Of course, by the description of this opponent, it's very possible he will start tilting as soon as things go against him.
I also thought that I would point out that there's a lot of good that can come out of investigating why this particular play has such a large winrate.
An interesting project would be to try to find an extremely weak-tight player whom people have a large number of hands on, and see how this player fares against the person under discussion.
The more that this player is able to run over weak-tight players, the longer variance can sustain an abnormally high win rate.
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