Avoid moving pawns, because they cannot go backwards.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown085"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[ECO "A00"]
[FEN "8/7k/2p5/5p2/2P1p3/3p4/1P1K3P/8 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. b4 Kg7 2. b5 cxb5 3. cxb5 Kf6 4. b6 Ke6 5. b7 Kd7 6. b8=Q { White wins with
a large material advantage. } 1-0