How do you respond to them?
Possibly helpful:
Grandmaster Repertoire 11: Beating 1 d4 Sidelines by Boris Avrukh (2012)
https://web.archive.org/web/20140627001415/http://www.chesscafe.com/text/hansen164.pdf
http://www.jeremysilman.com/shop/pc/Beating-1-d4-Sidelines-76p3724.htm
http://www.qualitychess.co.uk/ebooks/GM11-1d4Sidelines-excerpt.pdf
Dealing with d4 Deviations by John Cox (2005)
https://web.archive.org/web/20140627032909/http://www.chesscafe.com/text/hansen89.pdf
Other than waiting for responses here, try to see what other people do in similar positions, bonus points if you can see Grunfeld specialists’ (Svidler, Vachier-Lagrave, Nepomniactchi, etc.) responses
As far as I can tell:
- sometimes it maybe better to switch to a more KID type set up (with d6) especially when white develops the DSB to f4 (London in particular is not really a good way to play against a KID
- the Colle should allow you to get a decent Grunfeld (not sure)
I play the Sicilian against 1.e4 and aim to get into a grunfeld against 1.d4. Any thoughts or suggestions on what to play against the Colle, Trompowsky, Richter-Veresov etc? I find the positions a bit dry...