We have fairly reliable information that the AUD/USD strangle between .6380 and .6560 will expire in the last week of March so there is some more defence to come. The defender of the option is also a natural net-buyer of AUD and as such, is much more likely to be able to vigourously defend the bottom of the range rather than the top. In other words, if the turnover is heavy enough, the barrier is more likely to be breached on the top than the bottom. That said, I am not expecting this to happen soon as the momentum is lacking at the moment.