2012: $9.50 low
2013: $259.34 high
2013: $1163 high
2014: $339.79 low
As it relates to your idea, I don't know how the Gann Squares are relevant to bitcoins current trend (which is why I want more information about them) but I am skeptical that they alone could make a reliable prediction.
If it turns out in 2015 that this price area in March was really of high interest for Bitcoin I'm definitely going to read a book about his theories. So far this is just another experiment, like the many Fibonacci circles I started to use in my first charts (which are also great). Honestly my account was never intended to be serious, but about ongoing innovation in chart analysis. Reading books about this stuff is still ahead of me after I have chosen which topics of TA are worth my time to explore them deeper. I just started chart analysis with learning by doing in Q1 2014 and TradingView offers an awesome toolbox to play around. So far I hadn't tested the Gann square even once. I expect it to work better in long term charts, that is why I used it in a weekly chart now that Bitcoin is in another make or break price area around $275-$325.
Maybe we can get a better understanding in my next iteration of that chart when I apply 100% precise price and date from the actual MtGox low and not only some average from the "BTC pre-historic" price layer. Speaking of this, I already applied the actual MtGox pivot points on a newer chart where I also drew Gann fans, see:
On this previously mentioned more precise chart Bitcoin the price is also below a very long-term Gann fan (pink line), but much closer to it with a chance to get back above it: