This this two-move checkmate is attributed to Paul Morphy, when age ten. Hint: it features the Zugzwang paired with a quiet-move.
White to move.
Born in New Orleans June 22, 1837, Morphy played competitively in America and Europe for fourteen years between 1849 and 1863 and was considered the strongest chess player of his time.
Wikipedia: https://en.wikipedia.org/wiki/Paul_Morphy

Solutions :
Rook to a.6(a quiet move), pawn to a.6, pawn to b.7 checkmate
Rook to a.6, bishop off b.8, rook to a.7 checkmate
Rook to a.6(a quiet move), pawn to a.6, pawn to b.7 checkmate
Rook to a.6, bishop off b.8, rook to a.7 checkmate
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