see this article: http://www.chess.com/article/view/the-titan-of-the-20th-century-part-three
comments game two -- mar de plata variation
rf7- covers c7, prepares bf8 and rg7 to support a g4 pawn push.
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now the real question for KID players when do you and don't you push ...h5 (to support g4); a real headache!!! it's all very concrete - the analysis.
What is the point of ... Rf7 in king's indian defense?