We do not know. Of course you need a lot of practice and education in order to become one of the best chess players. And giving people that oppertunity does help people becoming grand masters. We can see this in the number and skills of chess players of the former Soviet Union but also specific areas like for example St. Louis, Missouri. But there does seam to be some unknown factor required to become the worlds best chess player. So we do not know what it takes to become a 3800 rated player and not a 2800 rated player.
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