Encyclopaedia of Chess Endgames
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Ka7!
pv 1. Ka7 Kg8 2. Nd5 Kf8 3. Kb6 Rd7 4. Ne3 Ke7 5. Nc4 Kd8 6. Ne3 Kc8 7. Nf5 Rd8 8. Ne7+ Kb8 9. Nf5 Rd7
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