Encyclopaedia of Chess Endgames
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f4!
pv 1. ... f4 2. Kb4 Kg2 3. a5 f3 4. a6 f2 5. a7 f1=Q 6. a8=Q+ Qf3 7. Qa2+ Qf2 8. Qd5+ Qf3 9. Qd2+ Qf2 10. Qg5 Qd4+ 11. Kb5 Qd3+ 12. Kc6 Kf2 13. Rf8+ Ke2 14. Qe5+ Qe3
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