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 "1945.??.??"] [Round "?"] [White "Wagenfuehrer"] [Black "Bergman"] [Result "1-0"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "r4r1k/pp1bq1pp/2p2p2/5P1Q/2B2R2/2R1P3/PP4PP/6K1 w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. Qxh7+ Kxh7 2. Rh4# 1-0