I don't agree that becoming a chess grandmaster is on the same level or even near the same level as becoming a Fields medalist or being in the shortlist of the best mathematicians alive.

> It really does seem that heavy investment from a young age by a good teacher can work wonders.

This is not the bet. It is not any arbitrary skill.

I specifically said

> I'd bet any amount of money you want that you could just do the same thing with any arbitrary human and create a mathematician of his caliber.