Openings teach you openings. Endgames teach you chess!
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[Event "Byrne's Combinations"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Robert Byrne"]
[Black "George Shainswit"]
[Result "1-0"]
[BlackElo "0"]
[FEN "1n6/8/5pR1/5p2/8/7k/P3K2p/8 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Kf2 { Now the Black pawn cannot promote safely. } 1... Nc6 2. Rh6+ Kg4 3. Rxh2 { The rest is just a matter of technique. } 3... Kf4 4. a4 Na5 5. Rh7 Ke5 6. Ra7 Nc6 7. Rb7 Kd6 8. Ke3 Nd8 9. Rb6+ Nc6 10. Kf4 Kc5 11. Rb5+ Kc4 12. Rb1 Kc5 13. Kxf5 Kd6 14. Kxf6 Na5 15. Rb5 Nc4 16. Kf5 Kc6 17. Rb1 Kd6 18. Kf6 Kc6 19. Ke6 Kc5 20. Rb8 Nb6 21. a5 Nc4 22. a6 Nb6 23. a7 Kc6 24. Rxb6+ Kxb6 25. a8=Q { White wins with a large material advantage. } 1-0