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 "Unknown520"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/8/p7/5k1p/1P3P2/4K3/8/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Kg4 2. Ke4 h4 3. Ke3 h3 4. Kf2 Kxf4 5. Kg1 Ke3 6. Kh2 Kd4 7. Kxh3 Kc4 8. Kg3 Kxb4 9. Kf3 a5 10. Ke2 Kb3 11. Kd1 Kb2 12. Kd2 a4 13. Kd3 a3 14. Kd4 a2 15. Kd5 a1=Q { Black wins with a large material advantage. } 0-1