... someone's talent might be an incredible photographic chess memory,...
Here we go again ...
First, Alfred Binet tested the notion that strong chess players had eidetic memory in the late nineteenth century. What he found instead was that strength in chess was rooted in recognition of patterns. Later studies have built upon this work, most notably the work of Adriaan de Groot (1946, English translation 1965) and also William G. Chase and Herbert A. Simon (1973).
Then, there is this: http://sciencenordic.com/does-photographic-memory-exist
Then lets forget photographic (or eidetic). You gave an example earlier of an intelligent boy who struggled. By the same token it seems reasonable to assume there are those who have above average pattern acquisition biology to enhance any effort spent studying.
My point being that work is necessary, but not necessarily sufficient.
... someone's talent might be an incredible photographic chess memory,...
Here we go again ...
First, Alfred Binet tested the notion that strong chess players had eidetic memory in the late nineteenth century. What he found instead was that strength in chess was rooted in recognition of patterns. Later studies have built upon this work, most notably the work of Adriaan de Groot (1946, English translation 1965) and also William G. Chase and Herbert A. Simon (1973).
Then, there is this: http://sciencenordic.com/does-photographic-memory-exist