OK, submitted a victory and now the wait to see if its accepted for the challenge.
I lost (or retired, rather) twice before getting the win.
What I learned: don't try to axe-rush Wang.

Peace is the way.
Due to the way regens work (and that's what mapfinder automates), I always shared continent with Korea and Mali; and started with at least 2 food and 2 floodplains and one gold or gems in the start.
With Mansa around, its not so hard to maintain tech parity.
I did not have stone, so no pyramids... No Oracle, no CS sling. 900AD is first time I get to Bur. About 1300AD is when I move up from Hered Rule. I did have the GLib, which was ok, but not as nice as with pyramids. So I played a cottage spamming peaceful game, with Wang and Mansa and I all being Hindu. I won Liberalism race (930AD) and took Astronomy to get all the trade routes from the other continent (not to mention another monopoly round of trading to keep me ahead of Mansa). Circumnav in about 900AD. Oxford about 1000AD.
Around this time I plan the backstab of Wang, because I have rifles and he doesn't even have muskets yet. Messed up the diplo (should have gotten forced peace or gotten Mansa in the war too), so Wang bribed Mansa to join. Mansa and I traded a pair of cities, and then I gave him another for peace to speed the mop-up of Korea. Now my size is a big advantage, and by taking Korea I have won the Statue of Liberty and Versailles, which help things along a bit.
From rifling I went the industrialism path to reveal aluminum. I saw that Mansa was going to get Legendary before I could launch, so I went up the military branch of the tree. Spammed tanks with plan to raze near legend cities... but they were sooooo nice and filled with non-obsolete wonders (Cristo R, Hollyw, R+R and much more) that I decided to keep them. Mansa had an air force but nothing worse than Inf, and not many of those. I pillaged his oil right away, of course, and he never got that tile back. I had a chance to wipe out his entire 20-unit air force on the war's 3rd turn, but lost the last battle at 60% odds, and he moved them out of harms way... to remain not much more than a little annoyance since I had Sam Inf and he was afraid to take them on (but it did slow movement of units to let sam inf keep up).
Peace after taking all 3 legends. Std Eth and Mining Inc were used in my best science and prod cities respectively. 3 Gorge dam built. After launching (AI just about to get plastics, W Orange about 60 turns from 3 legends), I used modern armor and eliminate Mansa from my continent (he had 3 island cities left I could be bothererd to take), and W Orange wiped Wangs last 2-pop island city off the map.
....
Note, I played this one again (sort of in parallel on a different computer... very confusing) and had stone, built 'mids and GLib, got CS-sling from Oracle. Worker stole from Wang very early. But I let Mansa talk me into war with Wang before I was ready, and stalled after taking 2 cities when he got Grens. I was also maybe slow to get ready for war, not being in right civics and such. At that time (about 1400AD) it started looking like it would take me longer than 1894AD to get a space race, so I just beelined Mass Media, built UN with 0% Research, and gold-rushed it for 9072 gold after about 10 turns of building the regular way. (Mansa gave me Mass Media for Biology after I put 2 turns research into it, saving me 4 turns. Diplo victory 1700AD .. justr thought it would be tooo tedious to have a another late game war). I do not know how to get to space on this level without at least two wars... one for early land advantage, and one for stomping down the AI who try to sneak some other kind of victory.
I really envy those folks who can get a space victory in 1400's before AI have a chance to make trouble.