This was neat. It reminded me of a similar story in poker history - Stu Ungar. Stu was a phenomenal player who won the World Series of Poker (WSOP) Main Event three times, in 1980, 1981, and 1997. Like Tosa, Stu had an uncanny ability to read his opponents and seemingly predict their moves.

Similar to Tosa, people questioned Ungar's poker prowess as to whether he was cheating or not (it's a pretty deep conspiracy rabbit hole that you can go down if you'd like). People wondered if he had some secret method for reading his opponents — like whether his blue glasses were letting him read marked cards, but it turned out to be like Tosa, he was a product of pretty deliberate and intense practice.

In both cases, it's a weird example of humans being exceptional at pattern matching in ways you almost can't imagine after deliberate practice.

Ungar is most famous for his WSOP win calling down with a ten high to win.

I think a fascinating aspect to all of this is the other idea in any edge based game where nearly all great players will start on a winning streak and how incredibly difficult it is to discern whether you are lucky or good (there's a small chapter in "The Signal and the Noise" about that specifically with poker players).