Weird puzzle

Feb 17, 2015, 7:50 AM |
I do not remember where or when I first saw this weird puzzle but I would like to share it with you guys..
you can see 3 white queens on the first rank and a black king on the (a) file. and the rule is: white plays and goes for checkmate using only the queens without them leaving the 1st rank!

Actually I first thought of posting it as a puzzle but it will be more entertaining to try to solve it without being able to see the solution.

well it's not as hard as it looks.
p.s: I'll post the solution in a comment after reading some..