Strictly speaking 2 solutions but you are forgiven
Checkmate in 1

No stupid tricks, no en passant, no castling.
White to move and checkmate in 1.
Bishop d5

... bd5 isnt mate in 1 its mate in 2 the only solution is bxa8=b# or bxa8=q#
Oh, I just realized that there were the queen (a4-e4)
But bxa8=b/q# then Qe4 also no mate in 1

No stupid tricks, no en passant, no castling.
White to move and checkmate in 1.
All of us were in traps. There're no solutions at all!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
No stupid tricks, no en passant, no castling.
White to move and checkmate in 1.
All of us were in traps. There're no solutions at all!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
With an extra black pawn on d7 you would be right!
... bd5 isnt mate in 1 its mate in 2 the only solution is bxa8=b# or bxa8=q#
Oh, I just realized that there were the queen (a4-e4)
But bxa8=b/q# then Qe4 also no mate in 1
the bishop is blocking the queen's access to e4

... bd5 isnt mate in 1 its mate in 2 the only solution is bxa8=b# or bxa8=q#
Oh, I just realized that there were the queen (a4-e4)
But bxa8=b/q# then Qe4 also no mate in 1
the bishop is blocking the queen's access to e4
Wow ,) (I'm blind)
No stupid tricks, no en passant, no castling.
White to move and checkmate in 1.