http://stockcharts.com/h-sc/ui?s=%24SPX&p=D&yr=0&mn=6&dy=0&id=p70142979615&a=266398464

Readers will immediately see the A-B-G-Z pattern being fulfilled here.  (See our recent letters.) We have almost always found buying at this point to be profitable.  Often in these cases we set a higher stop on the add-on than on the basic position.  In this case 2310.72