A passed pawn increases in strength as the number of pieces on the board diminishes.
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[Event "rated untimed match"] [Site "Skopje"] [Date "1972.??.??"] [Round "?"] [White "Westerinen"] [Black "Miyasaka"] [Result "1-0"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "r1b2rk1/1pq2ppp/p2b1n2/5N2/2B1p3/1P3Q2/PBP2PPP/R4R1K w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. Nh6+ Kh8 2. Qxf6 gxf6 3. Bxf6# 1-0