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 "Unknown288"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "7r/pp3k2/3p1P1n/3N4/2P3pp/4PnP1/PP3P1P/R4R1K b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Nf5 ( { Black can try: } 1... hxg3 2. fxg3 Nf5 3. Rxf3 gxf3 4. Kg1 { White wins with a large material advantage. } ) 2. Kg2 hxg3 3. Rh1 N3h4+ 4. Kf1 g2+ 5. Ke2 gxh1=Q 6. Rxh1 Nf3 7. h3 Ng5 8. h4 Rxh4 9. Rxh4 Nxh4 { Black
wins with a large material advantage. } 0-1