Gap Down on Open

We are leaving an upside gap so far today. Opening range is pretty much the high of the day. I am a seller all day unless we hold the 10 day m.a. at 925.00. I am selling rallies in front of resistance above at 937.25-939.25. My next support is down at 914.75-91275 below the 200 day moving average in the cash (918.27). I will be watching that 200 day very closely to see how it trades down there.