S&P 500 - reached 66% retracement mark. The entire rise to yesterdays high can end as a complex pattern. a-b-c-x-a-b-c or a double zig-zag in tech terms. A correction is 3 waves or 3+4=7 waves as in this case. or 3+4+4 and so on. The trendline of the lows is at 2706 so a close below that should mark a trend reversal.