Encyclopaedia of Chess Endgames
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Ra2+!
pv 1. Ra2+ Kg1 2. Kg3 h1=N+ 3. Kf3 Ng3 4. Rg2+ Kf1 5. Rxg3 Ke1 6. Ke3 Kd1 7. Kd3 Kc1 8. Kc3 Kb1 9. Rg1+ Ka2 10. Rh1 Ka3 11. Ra1#
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