This is the Nimzo Indian Defense...
		
		
	 
	
		
			To reach it: White moves this pawn forward
		
		
	 
	
		
			Black responds by moving his Knight
		
		
	 
	
		
			White then moves this pawn forward two squares
		
		
	 
	
		
			Black counters by playing this move (opens up squares for bishop)
		
		
	 
	
		
			Then when White develops his Knight...
		
		
	 
	
		
			Black pins it to the Queen