'they actually do not know how it works themselves'
Yep, the authors are in the same place as the people who did the first endgame lookup tables in Chess: 'Why is that move the best?' 'We dunno, it just is...'
Because I haven't seen anything to say otherwise, I am presuming that they didn't allow either of their headlining human opponents to practice against it. That would have made things more interesting.
Biting the hand that feeds IT
