I think the part of the notation that is confusing you is that since we're playing black, the 1st rank (e.g. a1) is white's rook on right side of board. So d6->c5 is moving our king to threaten his bishop. He can either retreat bishop or try to protect it with pawn or check us with knight as you mention. Checking us with knight doesn't help him, since we just take his bishop as we move out of check and he has no good followup. If he tries to protect with pawn, we just capture pawn with knight and put in him double check to take his rook with knight fork. Same thing happens if he moves bishop elsewhere.
By the way, if you like this move, please upvote my first reply, that means you would like this to be our next move (move with most votes is the one used for black). But act fast, only got like an hour before the vote counting is done.
Sorry, I only just noticed this. I upvoted but, based on what you said it is probably too late.
I must say, this is an inventive use of Steemit and it gets the whole community involved. Great thinking!