I guess the trap is that if white goes for Queen, black moves the bishop to take the pawn by the king. That bishop is protected by the knight nearby and forces the king to move. The only place the king can move is up. The other bishop is then moved to force a check mate.
Did I get it right?
Since the king is in check and the light squared bishop covers f3, the dark squared bishop covers e1 and e3, the knight covers d2 and f2, and the rest are blocked by white's pieces
Took me a while to understand the notation, now I know you're indicating that the B indicates a Bishop is moving from somewhere to D8. Ok, we're on the same page. Thanks for the confirmation
my guess would be moving the black bishop one to the left to place king into check, and then moving the other bishop into position. I also had an idea for castling and then using horse-castle placement for checkmate, but that's more than 2 moves