Encyclopaedia of Chess Endgames
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c7!
pv 1. c7 Ra5+ 2. Kc4 Rxd5 3. c8=Q Rd1 4. Kb5 Rb1+ 5. Ka5 Ra1+ 6. Kb4 Rb1+ 7. Ka4 Ra1+ 8. Kb3 Rb1+ 9. Ka3 Ra1+ 10. Kb2 Rd1 11. Qc7+ Ka6 12. Qc4+ Ka5 13. Qa2+ Kb4
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