A passed pawn increases in strength as the number of pieces on the board diminishes.
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[Event "rated untimed match"]
[Site "Hastings"]
[Date "1958.??.??"]
[Round "?"]
[White "Uhlmann"]
[Black "Darga"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "3r2k1/p3q2p/bpnrP1p1/5p2/P7/3R4/BB2QPPP/3R2K1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Rxd6 Rxd6 2. Rxd6 Bxe2 3. Rxc6 { The following line only delays the end: } 3... Ba6 ( { Black can try: } 3... Kf8 4. Rc8+ Qe8 5. Ba3+ Kg8 6. Rxe8+ { White wins
with a large material advantage. } ) 4. Bf6 Kf8 ( 4... Qxf6 5. e7+ Qf7 6. e8=Q+ { White wins with a large material advantage. } ) 5. Bxe7+ Kxe7 6. Rc7+ Kd8 7. e7+ Kxc7 8. e8=Q { White wins with a large material advantage. } 1-0