Encyclopaedia of Chess Endgames
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Kf4!
pv 1. Kf4 Kg7 2. a8=Q Rxa8 3. Ke5 Kf7 4. Kd6 Ke8 5. Kc6 Rc8 6. Kd6 Kf8 7. Kd7 Ra8 8. c8=Q+ Rxc8 9. Kxc8 Ke7 10. Kb8 Kd6 11. Kb7 Kc5 12. Ka8 Kd5 13. Kb7 Kc5
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