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 "Unknown398"] [Result "1-0"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "3r3k/1p2n1p1/p2qb1Bp/2rp1p2/5N2/P3PP2/1P1Q2P1/R3K2R w KQ - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. Rxh6+ ( { White can try: } 1. Qd4 Nc6 2. Rxh6+ Kg8 3. Bh7+ Kf7 4. Rxe6 Nxd4 5. Rxd6 Nc2+ 6. Kd2 Rxd6 7. Rc1 d4 8. e4 d3 9. Nxd3 g6 10. exf5 Rxf5 11. Rxc2 Rfd5 12. Rc3 Kg7 13. Bxg6 Kxg6 { With equal chances. } ) 1... gxh6 2. Qd4+ Kg8 3. Nh5 Nxg6 4. Qg7# 1-0