Really hard mate in 3

Ok, I'm not going to put the solution. first person to solve all critical variations gets a trophy. How cool is that? Mate in 3

Rxf7, Rxe7, Re6#

That's only white's moves. But the puzzle is a little awkward...I would just take the queen with my knight, maybe followed by taking the rook with my pawn and then promote the g-pawn.

Mmm...I guess I see another solution...Rxf7, g8=Q, Qe8#

I like the puzzle, it's fun:P

That works in many cases:

1. Rxf7 [2. Rxe7 ad lib 3. Re6#
                   2. g8=Q ad lib 3. Qe8#]
 1. ... e6 2. Re7 ad lib 3. Rxe6#
 1. ... e6 2. Rf6 ad lib 3. Rxe6#
 1. ... e6 2. g8=Q ad lib 3. Qe8#
 1. ... g5 2. Rxe7 ad lib 3. Re6#
 1. ... g5 2. g8=Q ad lib 3. Qe8#
 1. ... g5 2. g8=S ad lib 3. Sxe7#
 1. ... b4 2. g8=Q ad lib 3. Qe8#
 1. ... h4 2. Rxe7 ad lib 3. Re6#
 1. ... h4 2. g8=Q ad lib 3. Qe8#
 1. ... h4 2. g8=S ad lib 3. Sxe7#
 1. ... Qxa5 2. Rxe7 ad lib 3. Re6#
 1. ... Qxa5 2. g8=Q ad lib 3. Qe8#
 1. ... Qb4 2. Rxe7 [3. Re6#]
    2. ... Qxc5 3. Sd8#
 1. ... Qb4 2. g8=Q ad lib 3. Qe8#
 1. ... Qc4 2. Rxe7 [3. Re6#]
    2. ... Qxc5 3. Sd8#
 1. ... Qc4 2. g8=Q ad lib 3. Qe8#
 1. ... Qa3 2. Rxe7 [3. Re6#]
    2. ... Qxc5 3. Sd8#
 1. ... Qa3 2. g8=Q ad lib 3. Qe8#
 1. ... Qa2 2. Rxe7 ad lib 3. Re6#
 1. ... Qa2 2. g8=Q ad lib 3. Qe8#
 1. ... Qa1 2. Rxe7 ad lib 3. Re6#
 1. ... Qa1 2. g8=Q ad lib 3. Qe8#
 1. ... Qb3 2. Rxe7 ad lib 3. Re6#
 1. ... Qb3 2. g8=Q ad lib 3. Qe8#
 1. ... Qxc2 2. Rxe7 ad lib 3. Re6#
 1. ... Qxc2 2. g8=Q ad lib 3. Qe8#
 1. ... Rc4 2. Rxe7 [3. Re6#]
    2. ... Bxc5 3. Sd8#
 1. ... Rc4 2. g8=Q ad lib 3. Qe8#
 1. ... Rb4 2. Rxe7 [3. Re6#]
    2. ... Bxc5 3. Sd8#
 1. ... Rb4 2. g8=Q ad lib 3. Qe8#
 1. ... Re4 2. g8=Q ad lib 3. Qe8#
 1. ... Rg4 2. Rxe7 [3. Re6#]
    2. ... Bxc5 3. Sd8#
 1. ... Rg4 2. g8=Q ad lib 3. Qe8#
 1. ... Rh4 2. g8=S [3. Sxe7#]
    2. ... Bxc5 3. Sd8#
 1. ... Rxc3 2. g8=Q ad lib 3. Qe8#
 1. ... Re3 2. g8=Q ad lib 3. Qe8#
 1. ... Rg3 2. Rxe7 ad lib 3. Re6#
 1. ... Rg3 2. g8=Q ad lib 3. Qe8#
 1. ... Rg3 2. g8=S ad lib 3. Sxe7#
 1. ... Rh3 2. Rxe7 ad lib 3. Re6#
 1. ... Rh3 2. g8=Q ad lib 3. Qe8#
 1. ... Rd2 2. Rxe7 ad lib 3. Re6#
 1. ... Rd2 2. g8=Q ad lib 3. Qe8#
 1. ... Rd1 2. Rxe7 ad lib 3. Re6#
 1. ... Rd1 2. g8=Q ad lib 3. Qe8#
 1. ... Bg1 2. Rxe7 ad lib 3. Re6#
 1. ... Bg1 2. g8=Q ad lib 3. Qe8#
 1. ... Bg1 2. g8=S ad lib 3. Sxe7#
 1. ... Be1 2. Rxe7 ad lib 3. Re6#
 1. ... Be1 2. g8=Q ad lib 3. Qe8#
 1. ... Be3 2. Rxe7 ad lib 3. Re6#
 1. ... Be3 2. g8=Q ad lib 3. Qe8#
 1. ... Bg3 2. g8=Q ad lib 3. Qe8#
 1. ... Bh4 2. g8=Q ad lib 3. Qe8#
  But 1. ... Rf4! Rf3!

By the way, the software is German, S is Knight.

Ok, I'll give a clue. this puzzle by Edgard J Tchélébi,  won Europe Échecs 1962, 1° Prize. However, it was later found that Black had an unintentional defense, and the pawn on c2 was added to make it work properly. Hope that helps...

And here's another