Encyclopaedia of Chess Endgames
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Ra2!
pv 1. Ra2 Nc6 2. Kd3 Na5 3. Kd4 Nc6+ 4. Ke4 Na5 5. Kd5 Nc4 6. Kd4 Na5 7. Ke3 Nb3 8. Kf2 Na5 9. Ke3
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