Encyclopaedia of Chess Endgames
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a7!
pv 1. a7 Kb7 2. a8=Q+ Kxa8 3. Kg7 Rg1+ 4. Kf8 Rf1+ 5. Ke7 Re1+ 6. Kd7 Rd1+ 7. Kc7 Rc1+ 8. Nc3 Rxc3+ 9. Kd7 Rd3+ 10. Ke7 Re3+ 11. Kf7 Rf3+ 12. Kg6 Rf8 13. Kg7 Rb8 14. h8=Q Rxh8 15. Kxh8
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