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 "Unknown595"] [Result "1-0"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "3n1r1k/2r1qp1p/p3pR2/3pP2Q/1ppP4/2P1P2P/PP4P1/5RK1 w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. R1f4 Rg8 2. Rh4 Rg7 3. Rh6 f5 4. exf6 Qf7 5. fxg7+ { White wins with a large material advantage. } 1-0