BOJ hiked rates out fo the negative territory, yet the YEN depreciated. Some say the reason is, even though there was a rate hike, the BOJ had a dovish outlook. Additionally, since expectations are split on whether the FED will still to 3 rate hikes this year or stay on hold with current rates, this is causing the Yen to drop. Price has pushed above the 151 lvl and might be able to hit the 151.50 and possibly the 152. But let's say the FED does hold rates longer and the JPY does surge past 152. How far can it surge until the BOJ reacts. Also, since Japan is part of the G7 nations, will the other G7 nations/Central Banks allow for a capital flight out of the Yen to happen? I don't think so. Just like some of the G7 nations helped out Japan during the devastating earthquake and nuclear crisis in 2011, causing the Yen to surge, this could be one of them. Japan is the third largest economy, so if there is stability that threatens Japan which could jeopardize the economy of other nations, this won't be allowed to happen. Now it comes down to when the intervention will take place if price keeps pushing higher and/or price moving higher starts to temper itself, and how long positions on the short side can remain solvent. If you are unable to resist a move to the 160 lvl and remain solvent, this is not a pair to trade as you'll be hit with negative rollover interest as well as floating losses.