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 "Unknown30"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "4r1r1/1k4b1/8/8/8/4qR2/7P/3Q1KRB b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Qxg1+ 2. Kxg1 Bd4+ 3. Kf1 Rg1# 0-1