Majestic Chess chapter 9

I am stuck on the second part  with the sphix challenge where you have to find a way to get black not checkmated.

Does anybody know what move it is?

I don't want to spoil it...

Please tell me, I was stuck on it for about a year.

Rc6

Does anyone think that Rc6 is correct?

yeah, it is

OH!!! I thought it was black to move, not white.

why are there 2 light square bishops?

because it is bishop

In this position black can't be saved against mate in one. Either the diagram is incorrect (says 'white to move' anyway, but ok), or there is no solution.

Wait a second, I get it now. Quite vague though. But ok.

Not the move I'd play of course .

OK. I admit that i did the white to move wrong. It's supposed to be blacks move

HI!

lol (sad)

Rc6