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 "Unknown515"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "R7/8/2pr3p/p1k5/2P5/2K5/5P2/8 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Rxa5+ Kb6 2. c5+ Kxa5 3. cxd6 Kb6 4. Kd4 ( { White can try: } 4. Kc4 h5 5. f4 h4 6. f5 h3 7. f6 h2 8. f7 h1=Q 9. f8=Q Qd5+ { With a likely draw. } ) 4... c5+ 5. Kd5 h5 6. Ke6 h4 7. d7 h3 8. d8=Q+ { White wins with a large material
advantage. } 1-0