White will go e3 attacking the c4-pawn
		
		
	 
	
		
			Trying to defend this with b5 is not a good idea
		
		
	 
	
		
			Since white will go a4
		
		
	 
	
		
			If black defends with a6...
		
		
	 
	
		
			White will take on b5
		
		
	 
	
		
			Since the a6-pawn is pinned
		
		
	 
	
		
			And if black defends with c6
		
		
	 
	
		
			White will exchange on b5
		
		
	 
	
		
			and then go b3
		
		
	 
	
		
			achieving a better position