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 "Unknown313"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/1Pb5/3p2pp/p1pP4/2P1N3/1P2Kp1k/8/8 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Kxf3 g5 2. Nf6 Bb8 3. Kf2 Bc7 ( { Black can try: } 3... g4 4. Kg1 g3 5. Nd7 Bc7 6. b8=Q Bxb8 7. Nxb8 g2 8. Nd7 h5 9. Nxc5 Kg3 10. Ne4+ Kf3 11. Nxd6 h4 12. c5 h3 13. c6 h2+ 14. Kxh2 Kf2 15. Ne4+ Kf1 16. Ng3+ Kf2 17. Ne2 Kxe2 18. Kxg2 { White wins with a large material advantage. } ) 4. Kg1 Kg3 5. Nd7 h5 6. b8=Q Bxb8 7. Nxb8 h4 8. Nd7 ( { White can try: } 8. Nc6 h3 9. Nxa5 h2+ 10. Kh1 g4 11. Nb7 Kh3 12. Nxd6 g3 13. Ne4 g2# ) 8... g4 9. Nxc5 h3 10. Ne4+ Kf3 11. Nxd6 g3 12. c5 h2+ 13. Kh1 Kf2 14. Ne4+ Kf3 15. Nxg3 Kxg3 16. d6 Kf4 17. d7 Ke5 18. d8=Q { White wins with a large material advantage. } 1-0