Encyclopaedia of Chess Endgames
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Rxa8+!
pv 1. Rxa8+ Kxa8 2. Kxc7 Ka7 3. Kc6 Ka8 4. Kxb6 Kb8 5. Ka6 Kc8 6. Ka7 Kd8 7. b6 Ke8 8. b7 Kd7 9. b8=Q Ke6 10. Qb7 Ke5 11. Ka8 Kd4 12. Qf3 Kc4 13. Ka7
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