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 "Unknown181"] [Result "1-0"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "1r3rk1/pp1b4/2p1p1p1/2Pp2q1/3Q4/7R/PP3PP1/4R1K1 w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. Qh8+ Kf7 2. Rf3+ Ke8 3. Qxf8# 1-0