With the well articulated definition of fundamental as was discussed in this thread.

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Something that I have always sort of assumed is that advanced go players don't really have the same fundamental approach, and that there is sort of a clash of fundamentals, sort of like mixed martial arts fighting, where boxers with boxing fundamentals, square off against jiujitsu fighters with jiujitsu fundamentals, furthermore there should be a match between players fundamental approach and their abilities and disposition for a player to be successful. Does anyone else have any thoughts on this, or is it pretty much a given?

I'm nowhere near good enough to give an educated opinion, but here is how I see it. Until a certain point(maybe into the high amateur/low professional dans, maybe even higher) you learn new fundamentals, after that its mostly style and evaluation.

Good boxers know how to throw hooks, fakes or straight punches, but which one they choose depends on their style and the situation they are currently in. I assume its the same with go professionals.

I have no idea what your question is asking, but for the most part stronger players play very much according to "correct" go in regards to shape, spacing, etc., due to their reading and just experience.

But the difference between the win and loss is the same as any other rank.

I think you could argue that traditionally, shodan is the point at which a player should have a basic awareness of all of the fundamentals. This doesn't mean that there isn't room for refinement, that they always play to those fundamentals faithfully, or that there isn't a lot of other improvement to be made. However, I don't think there are going to be any giant leaps of understanding afterwards. Of course, with different rating systems, where this point lies nowadays could be a few ranks in either direction.

I think I can see your point, that there is a convergence of fundamentals as a players rank increases. IE a boxer in mixed martial arts, can't ignore the knee cap kick, and must add kicking to the training regimen. I would argue that there are perhaps raw differences in talent(body shape, muscle fiber or in go memory, perception, endurance...) that would make the convergence theory less straight forward to prove.