Feb 24, 2015 - 5:26 PM
The Swiss Half Fare Pass does not exist, although you may see people call it that. There is a 1/2/3-year card offered by the SBB and mostly used by Swiss citizens. That's called the "Half-Fare travelcard" (see here). However, tourists mostly need the cheaper "Swiss Half Fare Card", which is valid for one month. All information about that one can be found here. Both cards offer mostly the same, but there's a slight difference: the 1/2/3-year version also offers discounts on tickets to a few surrounding countries. The tourist version doesn't.
Supersaver tickets are explained here. They're only practical if you are 100% sure you will travel with a particular train on a particular day and time. If you miss the train you can't use the ticket for the next train and basically loose the money. This is unlike any other tickets or rail passes, which are flexible. The Supersaver tickets are up to 50% cheaper than regular ones. You get an additional discount if you own either of the Half Fare Cards, but not an additional 50%. It's 30% at the most. The tickets can be purchased from 14 days ahead of time, not sooner. They can sell out. Regular tickets and passes do not sell out.
How to choose the best pass is explained here.
Does this help you out?