question: How many points did Chicago win the last game they at home against Dallas?
#1 return Chicago 
#2 return home games of #1 
#3 return #2 that are against Dallas 
#4 return the  last of #3 
#5 return points of Chicago of  #4 
#6 return points of Dallas of  #4 
#7 return the  difference of #5 and  #6