Encyclopaedia of Chess Endgames
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b2!
pv 1. ... b2 2. Rh8 b1=N+ 3. Kxc4 a1=Q 4. Ra8+ Kb2 5. Rxa1 Kxa1 6. Kd5 Nc3+ 7. Ke6 Na4 8. Ke5 Kb1 9. Ke4 Kc1 10. Kf5 Kd1 11. Ke4 Ke1 12. Kf5 Nc5 13. Kg6
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