Laszlo Polgar would disagree [1]. He contends that raising a genius is something you can actually target intentionally (whether or not you should). His proof being 3 daughters who became GMs and one that was a generational talent. As far as audibles go, that’s quite a flex. Yes, the daughters are not all equally talented and chess isn’t quite the same as math, but we’re talking about gradiation within an achievement only reached by much less than 1% of all active players. To me that’s genius level. Also, it’s not necessarily an accident that the youngest is the one to have attained the best result. Evidence is quite clear that older siblings can help their younger ones achieve more faster because the younger ones see it as a path to follow/if they can I can.
Yes, but that kind of aristocratic tutoring is not scalable to the bulk of the population. You need the equivalent of deep PhD expertise in every subject to accomplish that, and even AIs are nowhere close to that level.
That showed that you can be the best at something low value if you spend more than it's worth.
Most of the people so could be chess grandmasters are busy applying their brains to something else.
That's just utilizing potential already present there and nurturing it far, the father was an established chess player and university professor and their mother is probably in similar range. Sure, it works, why would anybody argue against or find this shocking or relevatory?
Try the same with babies who are already visibly not the brightest (say in kindergarden group), their parents are also average or worse regarding intelligence. There is a ceiling, it may be high or not but its there. If you haven't experienced it in your life you are one of lucky few (and certainly didn't push yourself hard enough to sense it).
Same goes with memory - you can train it far, use various techniques. Then comes somebody natural (yet still far from what we would call genius) who didn't bother with any of that and immediately surpasses whatever was achieved. We are not created equal and all have hard boundaries, be it health, cognition, body regeneration and so on.
Even if you disregard the anecdote (n=1) thing, it's quite obvious that genius has a genetic component to it, and the father being a good chess player tilts the odds in his favor quite a bit.
Also, the idea that chess is a good proxy for genius is a bit out of date.