Quote from Cutten:
Actually, long EUR short CHF may be the best play. This cross rate is fairly stable, most of the other price-moving factors are very similar between these two currencies, so your risk if wrong will be quite low. If you're right, then CHF will decouple from EUR due to the debt/crisis shock, much as the GBP decoupled from EUR a year ago (whereas before it was in a stable range).
Being long JPY or USD vs CHF exposes you to the individual risks of those currencies - with JPY, the risk that things calm down and/or the BoJ intervene could cause a 10-15% correction. With USD, any number of factors could cause a huge move either way. But EURCHF is only going to move 10%+ under two scenarios I can think of - that the Eurozone goes down the toilet (e.g. severe banking crises in the member states, or the whole currency project falls apart), or that Switzerland has a UK-style economic debacle. Assuming the Eurozone doesn't melt down first (and this seems unlikely - Switzerland is more vulnerable by far to the international effects), it therefore provides something akin to a free put option. If wrong, the cross rate should stay stable. If right, then CHF could fall 30 or 40% against the Euro.