It was interesting to see USD/CHF reach a 1.1005 low just now and bounce straight back to 1.1030 at writing, as we see the stout defence of the 1.1000 barrier option we expected.

The pairing could hold the key. While the 1.1000 line holds general USD losses could be fairly contained. If 1.1000 gives out and reported sell stops are triggered then all hell could break loose.