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 "Lein, Anatoly"]
[Black "Tal, Mikhail"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "7Q/8/8/2p5/1p6/5K2/r7/6k1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
{ Win material, then checkmate. } 1. Qg8+ Kh2 2. Qxa2+ Kh3 3. Qg2+ Kh4 4. Qg4# 1-0