20. Rf2: is a bad move imo. Kf2: is better, because after Kf2: can Rhc8 be answered with Rfc1.
Or he could have played 20. Rf2: Rhc1 21. Nd4 f6 22. ef6:+ gf6: 23. Rbb2 Rc1 24. Rfc2 Rc8 25. Rc8: Rc8: 26. Rc2
knight endgame, or why you should learn a bit of basics
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Ok, this was a blitz game, so obviously there is not much thinking time for each move, but yet, my opponent still had around 2 min (out of five) after move 35.
Knight endgames are notoriously difficult, but this one should have been pretty easy to at least draw. I post this in the hope that some people will be cured of their caballofinalephobia (fear of knight endgames) (and also in the secret masochist hope that stronger players completely butcher my analysis).