Encyclopaedia of Chess Endgames
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Kb7!
pv 1. Kb7 Kc4 2. Kb6 b3 3. Ka5 b2 4. Rxb2 Kc3 5. Rb8 Kd2 6. Ka4 Kd3 7. Ka3 Kc4 8. Ra8 Kc3 9. Rh8 Kc2
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