Time for zugzwag. White mates in 2
Link to puzzle / Interactive board If you want to try without hints
FEN = Q5bk/R6p/7P/8/8/8/1p6/1K6 w - - 0 1
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Ra1 bxa1=Q+ 2. Qxa1#
My first try at one of these.
I think QG2, leaving the bishop as the only move for black, followed by QG7#
edit: ah, black could delay with bishop check, king take, pawn promotes, king takes and then stalemate :(
Clever setup