THE REAL REASON THE SWISS PEG ENDED it says. Not sure what is feasible in this article, but the gist is there.
The IMF had no idea that the Swiss were going to break the peg and they were not told because the Swiss knew that they would inform the very banks that control the IMF who would in turn front run the decision and profit to the tune of billion of dollars at the expense of the Swiss. The swiss knew the Euro is a dead currency and cut it loose as it was costing so much to maintain the peg. It has nothing to do with SDR.
The fixed Swiss Franc - Euro exchange rate (peg) was decided (in 2011) to stop speculation on the Swiss Franc, that drove its price (in other currencies) "too much". Then, earlier 2014, the ECB considered the euro too expensive, and started to drive it down, so low that the Swiss decided to end the fixed exchange rate. For the same reason as the speculators case earlier. The first decision caused a steep fall of the Swiss Franc, the last decision caused a steep rise (the frontrunners club jumped ofc on it). But since, that steep rise was sold away again, and its price is now back to what it was before. http://finviz.com/futures_charts.ashx?t=6S&p=w1 Of course, the gold selling club likes to spin the story abit, to increase sales figures I guess. "That just leaves gold" haha.