Encyclopaedia of Chess Endgames
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Rb3!
pv 1. Rb3 d1=B 2. Ra3 Bc2 3. Rxa6+ Kxa6 4. Kd8 Ka5 5. Ke8 Ka4 6. Kf8 Ka3 7. Kg8 Ka2 8. Kh8 Bb1 9. Kg8 Bd3 10. Kh8 Bf1 11. Kh7 Kb1 12. Kh8 Kc1
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