Encyclopaedia of Chess Endgames
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c4!
pv 1. ... c4 2. Bg5 Rh1+ 3. Ke2 a4 4. Rf8 Bd4 5. Ra8 Rh2+ 6. Kf3 a3 7. Rxa3 Rh3+ 8. Ke4 Rxa3 9. Kxd4
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