I'd absolutely love to see that experiment. It's something that I think would be applicable to so many other fields as well. But you'd also need to strictly con

I'd absolutely love to see that experiment. It's something that I think would be applicable to so many other fields as well. But you'd also need to strictly control for everything. As Botvinnik said, chess cannot be taught - only learned. If the adults are just phoning it in, the result is of course preordained. In my opinion, I think anybody (of at least 'normal' mental capacity) has the potential to make master. Will any of my adult students do so? Absolutely not. They want to improve at chess, but want to do so in a way akin to taking a pill. Like you obviously know there is an immense amount of work to improvement and chess improvement is extremely weird. For instance extensive tactics study are key for improvement, but it's not like you'll see it instantly reflected in your rating - and after some time of diligent work and effort, it's entirely possible that somebody's rating might have even decreased. Something I experienced, as well as most other stronger players I know, is the 'stair step.' You don't improve steadily and linearly, there's these weird huge jumps where it seems like somehow you wakeup one day and are just xxx points stronger. People understandably expect proportional rewards to proportional work, but that's just not how chess improvement works. I also think this is how so many adults get trapped in opening study - there the rewards can be immediately visible, even if it's not really all that helpful to your overall improvement. Kids don't really think about these sort of things and often just enjoy learning about the game and solving the problems. But adults are generally doing it as a means to an end and have much more difficulty dealing with the nature of improving at the game. And it can also directly lead to self doubt in them as they use this as an indicator that they've plateaued, lack talent, or whatever else. And lacking confidence in chess is a great way to kill your results.