Encyclopaedia of Chess Endgames
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Rb8+!
pv 1. ... Rb8+ 2. Ka5 Kc5 3. a7 Rd8 4. b6 Rd1 5. Ka6 Ra1+ 6. Kb7 Ra5 7. a8=Q Rxa8 8. Kxa8 Kxb6 9. Kb8 Kc5 10. Ka7 Kxc4 11. Kb6 Kb3
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