The hardest game to win is a won game.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown509"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "5k2/2Pq3p/3P4/8/4N3/4P1P1/6PK/8 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Nc5 Qf5 2. c8=Q+ ( { White can try: } 2. d7 Qh5+ 3. Kg1 Qd1+ 4. Kf2 Qc2+ 5. Kf3 Qf5+ 6. Ke2 Qc2+ 7. Ke1 Qc1+ 8. Ke2 Qc2+ { Draw by repetition of
position. } ) 2... Qxc8 3. d7 Qxc5 4. d8=Q+ Kf7 5. e4 Ke6 6. Qg8+ Kd6 7. Qxh7 { White wins with a large material advantage. } 1-0