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 "Unknown192"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r1q2rk1/p1p3p1/2pbRn1p/8/5B2/1QN4P/PP3PP1/R5K1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Rb8 ( { Black can try: } 1... Nd5 2. Bxd6 Qxe6 3. Bxf8 Rxf8 4. Rf1 { With equal chances. } ) 2. Qc4 Rb4 3. Qe2 Rxf4 { Black wins with a large
material advantage. } 0-1