That does it, yes.
If White is in spoilsport mode he play the killjoy 1.Nb4 and if Black
goes for the Blackburne mate White can play Nxd6+ after Qxh4.
But that is really splitting hairs. So I'd say yes. White has to play Nxe2
and The Blackburne Mate is on. Good.
Throwing in 16.cxb7+ does not really destroy the Blackburne mating idea.
(There is no perpetual after Nb5 then Nxa7+ Saving you the time there.
It was something I looked at.)
The blog has already had just under 200 views. A wee bit too late
for an update. I'll drop the repair into the next blog.
As a reward you get to choose the next mating Pattern.
Anything you like (even a rare one) I'll find a few on RHP.
Reminds me of all the analysis I saw years ago when people were trying
to bust one of Anderssen 's games. The Evergreen.
Good (reasonable) Computer programs had just become available and more
and more people were getting them (Fritz 2 era).
All kinds of moves were being suggested to make the win more mundane
and people were finding moves to mate the way Anderseen intended.
I think the Evergreen still passed the test, although it depended on how
far you took back the moves. You have save the RHP Blackburne Mate.
I've wondered too about those end of fen things.
Winboard drags them across as does Chessbase. but they seem to work without them.
Random position created in Winboard.
The fen is 8/8/2P5/5p2/8/3n2r1/8/8 w - - 0 1
remove the 'w--01'
and it still works.
I think the 'w' means White to move (what else can it be?)
and with no White piece it still shows.
8/8/8/5p2/8/3n2r1/8/8 w - - 0 1
Think it's best not to ask and leave it alone. It works.