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  3. Does this qualify as a back rank checkmate?


Technically it is a "back rank mate" however the use of the dark bishop to support the rook makes it feel like an "opera mate"

You mated on the back rank, so yeah its a back rank mate. Not sure about the Opera Mate thing. Gotta check.

Opebackrank mate?

Technically it is a "Piece-helped back rank mate"

Not back rank mate. It is mate

Not every checkmate delivered on the back rank is a back_rank_mate.

@Sarg0n Every rule has an exception.