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 "Unknown167"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "6k1/6p1/p1PP3p/8/3Rp3/4q3/6QK/5r2 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Rxe4 Qd3 2. Re8+ Kh7 3. Qe4+ Qxe4 4. Rxe4 Rd1 5. c7 Rxd6 6. c8=Q Rf6 { White wins with a large material advantage. } 1-0