SPX gaps down using SPY

Not long ago I was looking for a possible gap island reversal, which did not occur, but here is some viewpoint regarding gaps.

There have not been any large gaps down since March 1, 2009. A large gap down could be significant and could represent a downside breakaway gap and cause a trend reversal to downside. Often, if the gap down is not filled in the first 2 hours of trading, then further lows for that day are made.

Since March 1, 2009, using SPY, these are the gaps DOWN:
8/17:  made a spinning top, and daily double low, trend resumed up.

8/31:  gap down at 102.37 (from 102.67 prior day low) painted small green hammer, which makes sense since it was barely a gap down (only 30 cents).  Next day (9/1) ended down but with great volatility. the red bar on the day after the gap actually had a high (103.24) that closed the gap, but the day ended down at 100.20 .

9/2 another small gap down (99.78 from 99.99). Printed a doji that filled the gap.

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