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 "Unknown06"] [Result "1-0"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "1r3rk1/2p1qppp/p2pb3/1p1QP2n/3P3P/2N2N2/PPP3P1/2KR3R w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. exd6 Qxd6 ( { Black can try: } 1... Bxd5 2. dxe7 Bxf3 3. exf8=Q+ Kxf8 4. gxf3 { White wins with a large material advantage. } ) 2. Qxh5 { White wins with a large material advantage. } 1-0