Traps and tricks for White in the 4.Bf4 variation vs the Grunfeld I read in a book (I no longer remember what book) that there are a few traps for White in the 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bf4 variation vs the Grunfeld, and that the line is somehow popular among GMs, Black has no easy equality, etc. etc. Is anyone aware of what a few of these tricks / traps for White might be?

For example please notice GM Kavalek's comments after Bf4 in this article:

https://www.huffingtonpost.com/lubomir-kavalek/the-most-treacherous-defe_b_991426.html
https://www.youtube.com/watch?v=BX9Ax29jZ1k is video 1 of 4 explaining this system.  Mike Virgo has the links to the rest of the series.
One of the comments is:  "It is a good video, however, Roman makes one mistake. at 15:45, he forgot to place pawn on h3 back to h2.﻿"  Many minor errors show in most chess videos, so ensure you understand the moves.