Encyclopaedia of Chess Endgames
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Ra1+!
pv 1. ... Ra1+ 2. Kd2 Rh1 3. Ba6 Kf3 4. Bb7 Rb1 5. Ba8 Ra1 6. Bb7 Ra2+ 7. Kc3 Kf4 8. Kd4 Rd2+ 9. Kc5 Rxf2
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