Every Pawn is a potential Queen.
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[Event "rated untimed match"]
[Site "?"]
[Date "1925.??.??"]
[Round "?"]
[White "Opochensky"]
[Black "Alekhin"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "1k1n3r/ppp5/5p2/3p1qp1/PP1P4/2P2NPp/4QP1P/4R2K b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Re8 2. Qd1 Qxf3+ ( { Black can also win with: } 2... Rxe1+ 3. Nxe1 ( 3. Qxe1 Qxf3+ 4. Kg1 Qg2# ) 3... Qxf2 4. Qf3 Qxe1+ 5. Qf1 Qxf1# ) 3. Qxf3 Rxe1# 0-1