Beautiful site. Terrible exercises. On the first exercise when you sign up there is an extra unnecessary check with Queen on h7, then queen on h6. Straight to h

Beautiful site. Terrible exercises. On the first exercise when you sign up there is an extra unnecessary check with Queen on h7, then queen on h6. Straight to h6 is all you need to start off the combination. The extra check on h7 actually has the potential to disrupt white's attack if black responds correctly. In the exercise black does not. The rest of the exercises I tried were uninspired. A couple of suggestions: a) Have a goal in the exercises explicitly shown to the user (mate in 4, material advantage, winning end game, etc.) b) Please, please proof-check your exercises. At least have a link to report bad ones.