Originally Posted by
headinclouds
With all the recent confusion about which backtrack rules apply, I wonder if this itinerary would be valid.
MPM-DOH-CDG-LHR-DXB-LHR-USA-ASIA-NRT-xLHR-CPT.
Yes, your itinerary is valid
It backtracks through Europe/Middle East and so it must comply with the new rule, which is #3 below:
The main requirement is that one of the visits to Europe/Middle East must be "a transfer without stopover" and you have this at the end of your itinerary - NRT-xLHR-CPT.
The exclusion of South Africa/Mauritius is not applicable in your case because you are not travelling to/from Europe in both directions - one of your directions is via the Middle East, namely MPM-DOH.