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 "Dantas"]
[Black "Wexler"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "7k/pp1R3p/2p1pr2/4b3/PP2P1P1/7P/2P1Q3/4q1NK b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Rf2 { Attacking white's queen and threatening mate on h2. } 2. Rd2 Rxe2 3. Rxe2 Qxb4 { Black wins with a large material advantage. } 0-1