Exercises for positional evaluation I would like to improve my position evaluation skills. And as we all know - there are tons of tactical exercises , endgames studies, etc. But when it comes to exercises for positional evaluation - well - things are getting complicated.

So far I know these sources:
- 'How to Reassess Your Chess' workbook
- Aagard 'Positional Play' contains some exercises
- Khmelnicky 100-exercises test book (but it contains all kinds of puzzles)

I've read Dan Heisemann idea to work with complicated middlegame position and then process it with an engine. But IMHO it lacks clear plan presentation and overall view of what is going on the board. So my question is - can anyone point me to specialised book or webpage that contain more of position evaluation exercises with long descriptive answers?
Three recommendations from me:


Mastering chess strategy by GM Hellsten has annotated games with more than 350 positional exercises with detailed answers. He has also authored Mastering opening strategy and Mastering endgame strategy
Chess strategy: move by move by IM Hunt isn't quite a puzzle book, but looks at annotated games and asks you questions as you analyse the games
Practical Chess Exercises by Ray Cheng has a mix of all types of positions (tactical and positional across all phases of the game). There are a total of 600 positions with detailed explanations here