Every Pawn is a potential Queen.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown286"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/8/1P6/3k1r1p/K5pB/6P1/8/8 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. b7 ( 1. Kb5 Rf7 2. Ka6 Kc6 3. Bg5 Rf3 4. Be7 Rxg3 5. b7 Rb3 6. b8=Q Rxb8 { Black wins with a large material advantage. } ) 1... Rf8 2. Kb5 Rb8 3. Kb6 Kd6 4. Bg5 Rg8 5. Bf4+ Ke6 6. b8=Q Rxb8+ 7. Bxb8 Kd5 8. Kc7 Ke4 9. Kd6 Kf3 10. Ke6 Kg2 11. Kf5 Kh3 12. Kg5 { White wins with a large material advantage. } 1-0