Feb '17 should bring a trend change in GS the last high of 227.16 has been followed through with neutral movement. We would need a breakout of this level to confirm the upside direction, a close below 174.19 would indicate further downside.
Brexit has given sell signals with support at 144.96 and now 5 month bullish phase. A waterfall event similar to 2007, 2008 remains the technical reversal of fortune.