To put the lie to the idea that chess has no "physical" component, i.e. "hand-eye coordination". The memorization component of chess is 100% physical. You either have the circuitry for it (like hand-eye coordination is required in pool..), or you don't. While study is "required" to build the pattern recognition, if you don't have the physical circuitry, it won't stick. Same with the ability to hold a full chess position on your head (or 50 in a simultaneous exhibition..). You either have it genetically, or you do not. This can be trained, but I read a book on chess years ago that went into detail on what the author believed are the absolute critical mental circuits needed to achieve master level play. Backed up by research that reinforced that the brains of those who go on to reach master level quickly are simply wired differently.
This is all important, because chess is about time management. If you cannot glance at the board and immediately recognize "chunks" of the position at a glance, then you have to mentally calculate a continuation, which is not how master level players play. And takes extra time that delays the actual formation of an overall plan, as tactics are king. Tactics must be calculated before a general strategic plan can be worked through. Chess masters process the entire board at a glance, and immediately recognize tactical opportunities that may extend to 7 or more moves. They see the entire sequence at a glance as a function of recognizing the initial position.