The tricky London System

Hello everyone. Today lets  discuss about  the London System.

It has been played a lot by Norwegian World Champion Magnus Carlsen. This a very tricky opening  for white. We start with 1.d4 ,Black responds with 1.d5, then we play nf3 and Black play nf6, then we play bf4. This is the starting of the London System.

                                           Now I will show you a amazing trap.

                                 
                          Even a GM has fallen into this trap. Game:

                                                  Now lets discuss the mainline.

                                  Now lets see another variation in this opening.

                                                     Master Game:

                                              If you have any doubts,ask in the comments.

                                                                  Thanks

                                                                @samarjithbiju