nice fork on f7 and e4 with the threat of Qe8 indirectly protecting the knight - but is it enough?

White doesn't think so.

Pins the rook on the queen.

rook sacrifice. But taking the rook at d7 now could make things volatile. Rxd7 or Qxd7 c6 and there is a pawn threat on the rook or queen, a double threat on a7, and a double threat on b7.

offers material back and removes an attacker. Good idea but there are too many threats.

Bishop kills once.. threatens Qxa7.

Bishop kills twice.. same threat remains, in addition to discovered checks if the bishop now moves.

bishop kills thrice, black rook is pinned, all hope gone.

Or Ka8 Bb8+ and then either Ra7 Qxa7 checkmate, or Kxb8 Rbxb7+ Kc8 Qa8 checkmate.

Or Qxc7 checkmate,