Paul Morphy's checkmate in 2 puzzle

Paul Morphy's checkmate in 2 moves puzzle. Can you solve this ? 

I think it's a zwichenzug puzzle. Rook to anywhere a2-a5. The only legal move for black is to bring the bishop out, after which Rxa7#

I think it's a Zugzwang puzzle.

Ah yes, Zwishcenzug is an in-between move. Thanks.

No, because 1…a6

Thank you very much

Along with Plaskett's puzzle, and Richard Réti's endgame study, I see this puzzle far too often.

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It wouldn't be much of a puzzle is it had 4 solutions, would it?

So no. Even though you suggested 4 moves, all of them are wrong because of 1. - a6.

Also, Paul made this when he was 10 years old if I recall correctly.

Look, I saw Ra4, I just didn't like it. 

Honestly, this is the best integration of this meme i have ever seen. Nice job!

Video solution of this puzzle