Encyclopaedia of Chess Endgames
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a7!
pv 1. a7 Rg2+ 2. Kb1 Rg8 3. Bg3+ Rxg3 4. a8=Q Kd4 5. Kc2 Rc3+ 6. Kd2 Rd3+ 7. Ke2 Re3+ 8. Kf2 Rb3 9. Qa7+ Kc3 10. Kg3 Kc2+ 11. Kh4 Kc1 12. Qc7+ Kb1
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