Encyclopaedia of Chess Endgames
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Kb1!
pv 1. Kb1 e3 2. Ra2+ Kd1 3. Ra8 Kd2 4. Rd8+ Kc3 5. Kc1 Kc4 6. Kd1 Kc3 7. Ke2 Kc4 8. Kxe3 Kb4 9. Rf8 Ka3 10. Re8 Ka2 11. Re7 Ka1 12. Kd3
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