Suddenly it was obvious to me in my analysis I had missed what Fischer had found with the greatest of ease at the board.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown296"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[ECO "A00"]
[FEN "5K1R/8/8/6p1/8/6kp/8/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... g4 ( { Black can try: } 1... h2 2. Kf7 g4 3. Kf6 Kg2 4. Kg5 g3 5. Kg4 h1=Q 6. Rxh1 Kxh1 7. Kxg3 { Draw. } ) 2. Ke7 Kh2 ( { Black can try: } 2... Kg2 3. Ke6 g3 4. Kf5 Kf3 5. Rxh3 Kf2 6. Kg4 g2 7. Rg3 g1=Q 8. Rxg1 Kxg1 { Draw. } ) 3. Kf6 g3 4. Kf5 g2 5. Rg8 g1=Q 6. Rxg1 Kxg1 7. Kg4 h2 8. Kg3 h1=Q { Black
wins with a large material advantage. } 0-1