You did state that this was for stronger players, so I can't very well complain that it was too tough, but my 49% average score was a bit discouraging.  Definitely not a course for beginners.  I guess that my inexperience with most of the openings made it more difficult to get a feel for the positions.  Do wish you guys would either eliminate the alternative correct answers or give the main line correct answer as a reward for coming up with an equally strong move.  You have no idea how frustrating it is to come up with a good move, have it acknowledged as such, and then not be able to find the "correct" answer.  I do plan to go back over the course however and bang away at it until I can 100% it. 

Thanks

I'm in agreement with baddogno mostly. 40% of my score being dropped for one wrong answer seems a bit much. A lot of the lessons featured relatively useless subtle hints, such as the "wrong knight" lesson. The subtle hint basically restates what led up to the position and restates what mistake you are looking at. On the other hand, in London goes down 2 the subtle hint is excellent. I didn't find the answer immediately because of it, but after I did the hint made perfect sense. The lessons themselves are definitely good for players trying to strengthen their opening skills. Maybe it would help to show the lines that led to the position?