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 "Unknown74"] [Result "1-0"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "r1b2rk1/pp2q1pp/2pbpn2/3pnp2/2PP4/BP4P1/P3PPBP/RNQ2RK1 w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. dxe5 Bxa3 2. exf6 Qxf6 ( { Black can try: } 2... Bxc1 3. fxe7 Re8 4. Rxc1 Rxe7 { White wins with a large material advantage. } ) 3. Nxa3 { White wins with a large material advantage. } 1-0