http://www.chess.com/article/view/the-legendary-15-minute-drill
Thoughts?
Interesting! It might be hard for a coachfree improver to find mix problems of a suitable level?
Very good question! You could go to the original post, and ask that question. Maybe someone has an answer...
http://www.chess.com/article/view/the-legendary-15-minute-drill
Thoughts?