Avoid moving pawns, because they cannot go backwards.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown38"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "3rk2r/pQp1nppp/8/4Pb2/2p5/B1n1PN2/P4PPP/2K2B1R b k - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Rd1+ 2. Kb2 Na4# ( { Black can try: } 2... Rb1+ 3. Kxc3 Rxb7 4. Bxc4 { With a likely draw. } ) 0-1