I got distracted by my wonderful family and forgot about ditching some cities until I'd already hit enter. I gained almost 200 tiles with the cultural expansion caused by the Internet and ended up with a domination victory instead.
The Internet is always a problem... Instead of ditching cities, I have come up with a different solution, which I used a couple of times already (not only in 20K, but also in 100K or spaceship games). Once I've almost reached the dom limit (like 50 tiles before dom), I start founding towns along my current border and gifting them to my friend. (If you download my final COTM 135 file, you will recognize these towns by their names "Grenze1", "Grenze2", ....) As a tile directly adjacent to a city center can never be taken away be another town, whose city center is 2 or more tiles away, this provides a "fireproof" stop to my culture expansion, no matter how much culture my own towns may accumulate. Once this "culture fence" around my territory is finished, I can build as much culture in all my towns as I want, without ever having to fear another overstepping of the dom limit.
A bit care needs to be taken, where the coast is my border, but usually most coastal tiles are already inside my border, before I set up that fence, and the few that are not, can easily be counted and taken into account when setting up the fence. (And sea & ocean tiles don't count towards the dom limit.)
So I made my capital 20k-town, destroyed wonder-concurring cities or their tile improvements and built almost all wonders but GLH and Magellans due to the missing coast and HG because some viking town was quicker.
This is strange: I missed quite a few more wonders: in addition to the GLH, Colossus and Magellan, also Artemis, the Great Wall, Sun Tzu (and one more, if I remember correctly, need to check my .savs), but still the end date was a bit faster: 20K in 1595 AD. It will be interesting to compare our build order of wonders. I'll try to compile a list, once I get to the PC where I played the game.
