Encyclopaedia of Chess Endgames
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Ne4!
pv 1. Ne4 Kc6 2. Nc4 Kd5 3. Nf6+ Kc6 4. Ne5+ Kd6 5. Ned7 Ra8 6. Nb6 Rh8 7. Nc4+ Kc6 8. Ne5+ Kd6 9. Nfd7
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