Encyclopaedia of Chess Endgames
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Rb8!
pv 1. Rb8 a3 2. Rb5 Ka1 3. Kb7 a2 4. Kc6 a6 5. Rb7 a5 6. Kc5 a4 7. Kc4 a3 8. Kb3 Kb1 9. Kxa3+ Ka1 10. Kb3 Kb1
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