A passed pawn increases in strength as the number of pieces on the board diminishes.
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[Event "rated untimed match"]
[Site "Kasan"]
[Date "1929.??.??"]
[Round "?"]
[White "Samsomow"]
[Black "Neshmetdinow"]
[Result "1-0"]
[BlackElo "0"]
[FEN "Qn2k2r/p4ppp/2p5/3p4/7q/P1Pn4/2PPP1bP/R1BK2R1 b k - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
{ Mate in 2. } 1... Qe1+ 2. Rxe1 Nf2# 1-0