Encyclopaedia of Chess Endgames
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Rb1+!
pv 1. Rb1+ Kc4 2. Ka6 a4 3. Ka5 Kc3 4. Kxa4 Kd3 5. Ra1 Ke3 6. Kb3 Kd2 7. Rb1 Ke2 8. Rc1 Kf2 9. Ra1 Kg2 10. Ra3 Kf2 11. Kc3 Ke1
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