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 "Unknown98"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "4k3/5p2/1p2p3/1P2Pn1P/2pP1PP1/p1B4K/8/8 b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Ne7 2. h6 Kf8 3. Bb4 a2 4. Bxe7+ Kxe7 5. h7 a1=Q { Black wins with a large material advantage. } 0-1