Maintaining the 1.20 floor (not peg) is not hard when the CHF is weakening against the EUR, the SNB doesn’t need to do anything at all when the exchange rate is

Maintaining the 1.20 floor (not peg) is not hard when the CHF is weakening against the EUR, the SNB doesn’t need to do anything at all when the exchange rate is moving in the direction they want. They abandoned the floor more that a year and a half later, in January 2015, when the exchange rate was back at 1.20 despite their efforts to keep CHF appreciation under control.