There are some videos specifically for this one (6 I believe) in the videos opening series, intermediate level. In case it's useful.
Grunfeld
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Same if you look at the "Study Guide" intermediate level (Not sure about the exact name) it is listed as one of the "must know" and you can go to the opening explorer right from there to see the specific opening.
The grunfeld can have multiple spellings, most often Grünfeld, with the accent, or Gruenfeld (ue is the correct english approporiation of the ü I think).
I am currently studying the whit side of the gruenfeld if anyone in this thread wants to send me a challenge at 1-3 days per move with myself playing as white, title the challenge 'gruenfeld' or something so i know what it is.
Having just started playing again after a 20+ year hiatus, my bookshelf reminded me of a text I had wanted to get into but never had the chance. It was called "Zoom 001" and concentrates on Grunfeld variations as both White and Black. I looked in the Openings here but can't seem to find the Grunfeld listed! Is there another name for it? How do I find it here?