Encyclopaedia of Chess Endgames
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Rb7+!
pv 1. Rb7+ Kc4 2. Kc7 a5 3. Ra7 Kb5 4. Kd7 c5 5. Kd6 Kb4 6. Rb7+ Kc4 7. Rc7 a4 8. Rxc5+ Kb4 9. Rd5 a3
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