Helpstalemate in 2.5 moves

White to play. Black and White cooperate. White's 3rd move stalemates Black.
The problem has 4 solutions.

i think this is one (corner, with knght):
c8(N) Rd7+
Kxd7 Ka8
Kc7

another (corner, with rook):
c8(R) Rc7
Rxc7+ Ka8
Kc8

and (i like this one best!):
Ke8 Ka7
c8(Q) Rc7
Kxc7

edit: can't figure out the last one

c8Q+ Ka7
Qc6 Rc7
Kxc7

Try this one: Black to play and what would you play?

Quite a good puzzle.

oops, my last solution was flawed.. ian's is the correct version

Originally posted by pootstick
edit: can't figure out the last one

I'll try...
1. c8Q+ Ka7
2. Qc6 Rc7
3. Kxc7

Didn't realise ilywrin was posting a similar solution at the same time...

I know this is a miniature and AUW (probably the economy record for AUW), but I really don't like the repeated move 1.Rc7 in three different solutions. 😕