Encyclopaedia of Chess Endgames
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Rb5!
pv 1. Rb5 Ke6 2. Ka8 Kd5 3. b7 Nd4 4. b8=Q Nxb5 5. Qxb5 Kd4 6. Qb6 Kc4 7. Ka7 Nd3 8. Qb7 Kc3 9. Ka8 Kc2
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