Every Pawn is a potential Queen.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown133"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/5p2/p1k1p1p1/1pp1P2p/2P1KP1P/1P6/P5P1/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... bxc4 ( { Black can try: } 1... b4 2. Kd3 a5 3. g3 { Draw. Neither side
can make progress. } ) ( { Black can also try: } 1... a5 2. a3 a4 3. bxa4 bxc4 4. Ke3 Kb6 5. Kd2 Ka5 6. Kc3 Kxa4 7. Kxc4 Kxa3 8. Kxc5 Kb3 9. Kd6 Kc4 10. Ke7 Kd4 11. Kxf7 Ke4 12. Kxe6 Kxf4 13. Kf6 Kg4 14. e6 Kxh4 15. e7 g5 16. e8=Q { White wins with a large material advantage. } ) 2. bxc4 Kb6 3. Kd3 Ka5 4. Kc3 Ka4 5. Kb2 Kb4 6. a3+ Kxc4 7. g3 Kd3 8. Kb3 c4+ 9. Kb2 Kd2 10. a4 c3+ 11. Kb3 c2 12. Kb4 c1=Q { Black wins with a large material advantage. } 0-1