Encyclopaedia of Chess Endgames
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Na5!
pv 1. ... Na5 2. Rh4 Nc6 3. Ke3 Na5 4. Rg4 Nc6 5. Rf4 Na5 6. Kd3 Nb7 7. Ke2 Kc3 8. Rf5 Nd6 9. Re5
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