A few years ago, I was playing around with the box method based on a fib box system that Simplegreen brought to IHUB.
During testing, I often found that 3 boxes was about as far as the market could push a particular pair in any given direction without a retrace.
The basic rule was that once the 3rd box got hit, the price would retrace back to the 1st box level again.
EU is basically there. Can't rule out a bit more topside but it's pretty limited from these levels.
EU 4 Hour Chart...
To add to that pennies, after the initial breakout of the box if price fails to reach the target level it usually falls back through the original box and out of the other side.
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