Encyclopaedia of Chess Endgames
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f3!
pv 1. f3 Kc1 2. d4 Kd1 3. Kd3 Rd2+ 4. Ke4 Kc2 5. f4 Kc3 6. d5 Kc4 7. f5 Rd4+ 8. Ke5 Rxd5+ 9. Ke6
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