Bobby just drops the pieces and they fall on the right squares.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown200"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "6R1/P7/4p3/1p4p1/3P2kp/1b2ppB1/1P5P/4K3 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... hxg3 2. a8=Q f2+ 3. Ke2 Bc4+ 4. Kxe3 f1=N+ ( { Black can try: } 4... f1=Q 5. Qe4+ Qf4+ 6. Qxf4+ Kh3 7. Qxg3# ) 5. Ke4 Bd5+ 6. Ke5 Bxa8 7. hxg3 Bd5 8. Kf6 Nxg3 9. Rxg5+ Kf4 { Black wins with a large material advantage. } 0-1