Easy, since I had seen the game before in one of chess.com's articles :)

The white queen can't offer herself along the back rank or on the critical diagonal, or she can be captured without black surrendering the defense of e8.

HARD

very difficult 

Suicidal Queen! (lol)

Difficult puzzle but very instructional.

hard but nice by Michael Adams :-)

Interesting. :] Difficult. :]

I had seen it in a book... Superlative deflections technique! 

difficult.................

very tough one

I look forward to the Saturday puzzles, they seem to be the hardest ones to solve.

And this one was a real strain on the brain, best I have seen in a while.

Please ! More like this !

 wtf

oh, the queen has to defend e8.

i dont get it. why would the queen not be taken?

  its too hard for me!!!!!!!!!!!!

Superb!

i hope tomorrow's( Sunday) will be easier

hard one indeed.

This puzzle very familiar.... I saw it somewhere before!