Good Idea, some mistakes

Very good tactic app, though there are some idiots who upload illegal positions and unsolveable problems. At the moment there is a technical bug, but I hope I will soon be able to solve more tactics ;)
(Note for persons under 2200 FIDE: If you want to get better, set up the pieces on a real board and calculate there. The 3-dimensional thinking is important for the progress)

postnubilaphoebus about Chess Tactics and Lessons, v1.1