http://theamazingchessworld.blogspot.it/2012/10/the-steps-method_10.html I have completed 50% of the "manual for Chess Trainers" and "Step 4 Workbook".
going through 247 exercizes while making 14 mistakes. That means a 94,3% hit ratio. I liked the quizzes and I find some of them quite challenging.
Just to give you an idea, here you will find a position that I liked under the topic "The magnet". Black to move:
As White threats Qxg7 mate, Black needs to hurry up.....
Solution: 1...Qh1+ 2.Kxh1 Bf3+ 3. Kg1 Rd1 mate
While here's a position where I went astray :-( White to move.
I chose 1.Bg5 but 1...g6 keeps Black position.
The right move is 1.Ng5 if fxg5 2.Qh5+ and double attack on the rook as well. While 1...g6 2.Qh4+ and mate in 3 to follow.