Avoid moving pawns, because they cannot go backwards.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown171"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "6k1/p7/4pQK1/3pP3/3P4/7q/5P2/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qh7+ ( { Black can try: } 1... Qd3+ 2. Kg5 Qd2+ 3. Kg6 Qd3+ 4. Kg5 { Draw by repetition of position. } ) ( { Black can also try: } 1... Qf5+ 2. Qxf5 exf5 3. Kxf5 a5 4. Ke6 a4 5. Kd7 a3 6. e6 a2 7. e7 a1=Q 8. e8=Q+ Kg7 9. Qe5+ Kh6 10. f4 Qb1 11. Qxd5 { White wins with a large material advantage. } ) 2. Kg5 Qg7+ 3. Qxg7+ Kxg7 4. Kf4 Kg6 5. Ke3 Kf5 6. f3 a5 7. Kd3 Kf4 8. Kc3 Kxf3 9. Kd3 a4 10. Kc3 Ke3 11. Kb4 Kxd4 12. Kxa4 Kxe5 { Black wins with a
large material advantage. } 0-1