@greysensei said in #8:
> I think the OP forgot to specify the age of the hypothetical person. This is a huge factor. Improving at chess is like learning a language - much easier & faster when you're young.
This is a misconception. Learning a language is actually easier and faster as an adult. Children take a very long time to learn language, 8+ years, whereas an adult can become fluent in 4 years or less. The main difference is that adults can take advantage of what they already know as well as formal learning methods, whereas children need to pick up the language without instruction.
Chess is under a similar misconception. In order for an adult to become a GM without playing as a child, they would need to drop everything and devote their lives to chess for many years.
That just doesn't happen.
By the time you are an adult, you have a job and you have hobbies and a social circle and none of that involves chess.
A child, on the other hand, does not need to pay bills, does not have a rigid way of life yet. They are expected to have an interest in games and the narrative of a child chess prodigy is well known. Such a child would receive support and encouragement.
And to top it all off, the child has many more years of vigorous life in which to study chess. A new learner at age 20 must face rivals the same age who have been studying for 14 years. The amount of time is more important than the period of life in which it occurred.