In order to receive the most recent and applicable information, passengers are encouraged to contact the airlines directly so that there isn't any confusion as to what is allowable or restricted on their itinerary.
Right, just phone the S7 call center and ask about open-jaw segments on a DONEWC4 itineraries. Check.
I'm not the greatest fan of Expert Flyer, but it's good to be able to go there and pull up the current rules (as published on the GDSs) and fares. I just had a quick glance at the Circle Explorer rules and it doesn't look like too much if anything has changed.