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 "Unknown185"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "4r1k1/1pp1rq1p/pb1p1pp1/2nP4/1PP2P2/P1Q3NP/1B4P1/4RR1K b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Rxe1 2. Rxe1 Na4 3. Rxe8+ Qxe8 4. Qd2 Nxb2 5. Qxb2 Qe1+ 6. Kh2 Qg1# 0-1