Well this is the power of the move Bg5! Your opponents terrifying from the pin instead of play Be7 and unpin the knight , they choose to weaken the Kingside pawn structure. Now after 6.Bg3 any attempt from the black side to develop the bishop either on e7 or g7 and castle Kingside hides a huge risk because of the weakened light squares around the King! The move 5...g5 it's a consession from the second player that occurs in your games because your opponents does not realize the risk.
Queen's gambit problem

Well this is the power of the move Bg5! Your opponents terrifying from the pin instead of play Be7 and unpin the knight , they choose to weaken the Kingside pawn structure. Now after 6.Bg3 any attempt from the black side to develop the bishop either on e7 or g7 and castle Kingside hides a huge risk because of the weakened light squares around the King! The move 5...g5 it's a consession from the second player that occurs in your games because your opponents does not realize the risk.
Ok so this position (roughly) is what I was wondering about.
Bg5. When I am reading about this opening I hear about how this is a good thing to do and yet every time I play it this happens.
So why do I never see any examples of this happening in demonstration games? Is this because of the level I am playing at or something else?