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 "Unknown594"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/3Q2p1/1p2p1k1/1nq2p1N/8/8/5PPK/8 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Qxg7+ ( { White can try: } 1. Nf4+ Kh7 2. Qf7 Nd6 3. Qg6+ Kg8 4. Qxe6+ Kh7 5. Qg6+ Kg8 6. Ne6 Qe5+ 7. f4 Qf6 8. Qxf6 gxf6 { With a likely draw. } ) 1... Kxh5 2. f4 e5 3. Qg5# 1-0