Encyclopaedia of Chess Endgames
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Rb4+!
pv 1. Rb4+ Ka1 2. Kc2 Nc6 3. Re4 Nb4+ 4. Kb3 Nd3 5. Rd4 Kb1 6. Rxd3 a1=N+ 7. Kc3 Kc1 8. Rd2 Kb1 9. Re2 Nb3 10. Kxb3 Kc1 11. Re1+ Kd2 12. Re8 Kc1 13. Ka3
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