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 "Unknown325"] [Result "1-0"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "5k2/R4p2/1p3n2/5NN1/2b2PP1/4K3/p7/r7 w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. Ra8+ Ne8 2. Nh7+ Kg8 3. Nf6+ Kf8 4. Rxe8# 1-0