Encyclopaedia of Chess Endgames
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a6!
pv 1. a6 Kxh7 2. a7 Kxh6 3. e4 Kg5 4. e5 Ra8 5. Kb6 Kf5 6. Kb7 Re8 7. a8=Q Rxa8 8. Kxa8 Ke6 9. Kb7 Kf5
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