Encyclopaedia of Chess Endgames
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Rb7!
pv 1. Rb7 a1=Q 2. h7 a5 3. h8=Q+ Qxh8 4. Rb8+ Kd7 5. Rxh8 Kc6 6. Kf3 a4 7. Ra8 Kb5 8. Ke3 Kb4 9. Rb8+ Kc3 10. Ra8
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