Encyclopaedia of Chess Endgames
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Ra2+!
pv 1. Ra2+ Kd1 2. Kd3 e1=N+ 3. Ke4 Kc1 4. Ra1+ Kd2 5. Ra8 Kc1 6. Kf5 Kd2 7. Ra2+ Kc1 8. Ra1+ Kd2 9. Kg6 Nc2 10. Ra8 Kc1 11. Ra2 Kb1 12. Ra8
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