By the rules I have (and PaulSEA1 has been told that they have changed to allow intercontinental backtracks) you can't return back to Europe after leaving it - disallowed both as an intercontinental backtrack and a return to your continent of origin. So SYD-JNB via LHR and CPT-BKK via LHR would not be allowed.

The rules I have allow intercontinental backtracking only between North America and South America and a non-stop transit in Asia on route to Europe or vice versa. By these rules you can't do the 2 passes through Asia and include Africa in your itinerary. It has to be Europe-(Asia)-Australia-Asia-North America- (+/- South America) -North America -Europe.

So the only way you can get two passes through Asia is on a 4 or 5 continent.

Six continents has to be Europe-Africa-Asia-Australia-The 2 Americas-Europe or Europe-Asia - Africa -Australia- The 2 Americas - Europe.

Now if PaulSEA1's info is correct it seems anything is possible. But I don't go by what anyone in reservations says when it comes to this RTW fare - the printed rules are the only thing I accept!!