Avoid moving pawns, because they cannot go backwards.
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[Event "rated untimed match"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "Ferarini"] [Black "Moresi"] [Result "*"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "k1r1r3/p5p1/1b1Q4/nN2B3/4p3/1B3pPq/1P3P1P/R2R3K w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. Bd5+ Nb7 2. Qb8+ Rxb8 3. Rxa7+ Bxa7 4. Nc7# *