Tami wrote:It could well be that at 5k most players will be familiar with proverbs and general advice, even if they don't always apply them, and the ones that aren't familiar will be quite good at fighting and tesuji in order to make up for it.
I say this because I noticed the same thing in chess: once you reach 1700 you can be more-or-less certain that anybody else you meet of 1700 or higher will be pretty well acquainted with their Nimzowitsch, etc., and you can't expect to increase your win rate against them just by reading Nimzo for the 19th time (for My System, substitute Lessons in the Fundamentals of Go). Instead, you simply have to work through specific positions and become acquainted with concrete issues (I found the Russian concept of "priyomes" helpful in this, and I'm sure it has its analogue in go, but that's another discussion).
I play in this range, and I'm not sure that chess is a good model here. My best guess as to why this range tends to be a common plateau is that progressing from this point requires developing a more balanced game. My impression is that I and my opponents tend to have a VERY basic understanding of all of the elements of the game, but we tend to be proficient in only one or two. For example, I just played someone who played a terrible fuseki followed by a shockingly strong middle game, and then a passable endgame. In short, he wins based solely on is middle game skills. I play a strong fuseki, and until recently, I won or lost based on the advantage I built up at the start of the game.
To progress from here, I think one has to start focusing on developing a broader set of skills. For example, @Knotwilg pointed out a few months ago that players in our range do not properly utilize influence. Made sense. So, I started opting to build influence at every chance to force myself to learn how to use it. However, in doing so, I exposed a number of weaknesses in complementary skills. Players at this level readily give up influence for territory, but they are also not blind to the threat the influence poses. What usually happens is that they allow the influence to develop more than a stronger player would and then try to neutralize it by overplaying. For example, by invading a moyo too deeply. The result is usually a fight which then requires a better understanding of shape and tsumego than I currently have -- my opponents usually break out or manage to live inside when they shouldn't.
I think what makes this stage very hard is that it is not at all obvious where one's holes are and progress requires devloping multiple skills.
Also, you mentioned basic proverbs. I think people in this range are probably familiar with them, but we still misapply them regularly. Dwyrin (
https://www.youtube.com/user/dwyrin) has a nice series called "Back to Basics" where he tries to demonstrate that it's possible to beat SDK players just by focusing on basic principles and making large moves. In general, I think he's right, but his commentary also makes it clear that the application of basic princples often requires a decent set of complementary skills.