A passed pawn increases in strength as the number of pieces on the board diminishes.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown512"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "3r3r/1k3p2/pp1p2p1/2p1b3/1PPn4/P2Q4/6P1/5RK1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Rxf7+ Kc8 2. Qe4 Ne2+ 3. Kf2 ( { White can try: } 3. Qxe2 Bd4+ 4. Rf2 Rde8 5. Qg4+ Kc7 6. Qd1 Rhf8 7. bxc5 Bxf2+ 8. Kf1 Bxc5+ 9. Qf3 Rxf3+ 10. gxf3 { Black
wins with a large material advantage. } ) 3... Bg3+ 4. Kf3 Nd4+ 5. Kxg3 { White wins
with a large material advantage. } 1-0