The best case scenario for the SNB is a strong dollar and a neutral euro. USD/CHF demand helps bolster demand for EUR/CHF since large USD/CHF flows tend to be legged into via the components by the market makers.
So the US-centric dollar rally we are seeing at the moment is somewhat supportive for EUR/CHF. IF it becomes a euro-rout because of bad Greek news, that advantage will be lost and pressure on the cross will return.
EUR/CHF trades steady at 1.2056, near the highs of a tight intraday range.