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 "Unknown479"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r1bq1r2/pp1pb1pk/1nn1p3/4P1p1/2PP3P/P7/5PP1/RNBQK2R w KQ - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. hxg5+ ( { White can try: } 1. Qh5+ Kg8 2. hxg5 Rf5 3. Qh7+ Kf7 4. g6+ Ke8 5. Qg8+ Bf8 6. g4 Ne7 7. Qh7 Rf3 { Black wins with a large material advantage. } ) 1... Kg8 2. Rh8+ ( { White can try: } 2. Qh5 Rf5 3. Qh7+ Kf7 4. g6+ Ke8 5. Qxg7 Bf8 6. Qh8 Nxc4 7. g7 Qa5+ 8. Nd2 Ne7 9. gxf8=Q+ Rxf8 10. Qg7 { Black wins with a
large material advantage. } ) 2... Kxh8 3. Qh5+ Kg8 4. g6 Rf5 5. Qh7+ Kf8 6. Qh8# 1-0