Switzerland, like China, used to peg its currency to its major trading partner to avoid an appreciation. Today a Swiss stunner sends euro to 11-year low against buck. Of course it also (primarily) caused a crash of the euro. The end of the Swiss Central Bank Policy to peg the currency to the Euro, has consequences for the value of the euro against the dollar (the "Buck"). Why? 

 More Background material can be found here and here and the videos here and here