Spezi wrote:Solving tsumego doesn't seem to imrove my game, too. ... Not looking at the solution, solve the next one after I'm sure I have it right. ... Didn't feel like I improved at all, not even my reading ability. ... When solving problesm I apply what I already know, nothing new.
If this method doesn't help you, try another: Try to solve tsumego, and if you cannot solve it within a short time (a minute or two), look at the answer and learn it by heart, so that you can solve it instantly when you see it next time. Hardwire it. Doing so will probably improve your reading as well.
Spezi wrote:But reading more advanced tesuji books seem like a waste of time (dictionaries and problem books).
Same advice as above: Learn the tesuji by heart so that you instantly recognize it when you see it.
Spezi wrote:Replaying professional games doesn't seem to help me.
Don't just replay, but learn it by heart, so that you can lay them out on the board days or weeks later. The best would be commented games of professional players.
Spezi wrote:And playing games seems pointless, too.
Probably true unless you review them and/or get them reviewed by stronger players.
Spezi wrote:I don't plan on teaching Go. In my opinion I understand it too little to teach someone.
This is a wrong assumption. You can easily teach others when they are five stones or more weaker than yourself.
Spezi wrote:Teaching someone who could profit by having me teach him could improve faster by simply playing games and reading the books I told about (one reason I listed them) (in my opinion) (from my experience).
Another wrong assumption. There are players that are stuck at around 7k (like me) who might profit by being taught by 2d players (like you).

