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 "1841.??.??"] [Round "?"] [White "Popert"] [Black "Cochrane"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "r2n1rk1/1ppb2Pp/1p1p4/3Ppq1n/2B3P1/2P4P/PP1N1P1K/R2Q1RN1 b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Qxf2+ 2. Rxf2 Rxf2+ 3. Kh1 Ng3# 0-1