Wikipedia is often a good starting point: http://en.wikipedia.org/wiki/Grunfeld_Defence
Grunfeld question
ok, anybody else please?? oh and im adding his plan for KP defense- sicilian Kan-please no remarks about how different they are or how he should start wih the good old e4e5 all i want is your plans/ favourite variations of either the grunfeld or sicilian Kan
Try here, you can download loads of openings here. I can't help you with "ideas", but plenty of variations here:
http://www.pgnmentor.com/files.html#openings
I know that White should not take the c5 pawn because it loses control of center and it can be recovered with Qa5. I made a topic on Grunfeld...if you go to it you'll probably see a lot of good information that I still haven't applied, myself.
One reason you're not getting responses is that your question is too general. There are more than a dozen books written on the Grunfeld. You want a summary in a forum post? Good luck.
The link you got to the Wikipedia article is probably what you're looking for unless you have a more specific question.
ı play gruenfeld defense as black . the main idea in exchange gruenfeld ; is giving the center to opponent , but you can attack center pawns with c7 - c5 and your fianchetto bishop ( g7 ) etc .
In modern exchange variations ( Bc4 ' s which AfafBouardi showed on demonstration )white can sacrifice the a1 rook against your g7 bishop ( in AfafBouardi ' s all line is 10. Be3 Bg4 11.f3 Na5 12. Bd3 ( Bxf7 is Sevilla variation which played between karpow and kasparow in Sevilla is equal variation , white has got 1 more pawn but black can compance it ) 12 ...cxd4 13. cxd4 Be6 14 . d5 Bxa1 15 . Qxa1 f6 line has got a deep theory which contains 30 moves and endgame you have an extra knight against 2 pawns and endgame is equal :)
also you probably have more pawns ( you have 2 pawns and your opponent has only 1 pawns on queenside ) so it's an advantage in endgame . gruenfeld is semi-open opening , it's a bit sharp variation but playing gruenfeld is enjoyable .
In the Gruenfeld, Black intends to get active piece play and undermine White's center. In the endgame, Black often has a queenside pawn majority that can lead to an outside passed pawn.
The Kan is similar in that Black lets White get an early pawn center that often crumbles.
A lovely thrashing of White's errors against the Kan is evident at "Transpositions."

hello!! theres a member in the chess club i go to and hes rated USCF 1800-1900.....hes going to learn openings he wants to learn about the grunfeld....1.d4 nf6 2. c4 g6 3. nc3 d5......could people put in there ideas about what the plans are for both sides of this opening and list some variations?? thank you very much