Encyclopaedia of Chess Endgames
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Rb4+!
pv 1. Rb4+ Ka6 2. Kd6 Ka5 3. Rb8 Nb6 4. Kc5 Ka6 5. Rxb6+ Kxa7 6. Kc6 Ka8 7. Ra6+ Kb8 8. Ra5 Kc8 9. Ra8#
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