Encyclopaedia of Chess Endgames
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Ra5+!
pv 1. Ra5+ Kb1 2. Kc3 Kc1 3. Rh5 b1=N+ 4. Kd4 Kd1 5. Rh1+ Kc2 6. Rh8 Kb3 7. Ke5 Kc2 8. Rh1 Na3 9. Rh2+ Kb1 10. Kf6 Ka1 11. Rh1+ Ka2 12. Rh8 Kb2 13. Rb8+ Ka1
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