Encyclopaedia of Chess Endgames
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Kb6!
pv 1. Kb6 Kb8 2. Rb3 Nc8+ 3. Kc6+ Ka7 4. Re3 Nd6 5. Ra3+ Kb8 6. Kxd6 Kb7 7. Rb3+ Ka6 8. Kc5 Ka7 9. Kc6 Ka8 10. Kc7 Ka7 11. Ra3#
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