Encyclopaedia of Chess Endgames
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Ka7!
pv 1. Ka7 Kd7 2. b6 Rb3 3. Kb7 Kd6 4. a7 Kc5 5. a8=Q Rxb6+ 6. Kc8 Kb4 7. Kd8 Kb3 8. Qa7 Rb5 9. Ke8 Rb4 10. Qa8 Ra4 11. Qb7+ Ka2
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