no one does seem to know the Airfield cheat .

I dunno , maybe I am using an old version or something or maybe it's common knowledge but:

if you build Airfields over mined hills it gives you both the advantage of the mining and it also gives you farmland (well you dont see it but try to work that tile with a city ; look at the output : 4 shield 3 food.)

am I the naive guy who's just discovered this ?

Here's what I feel to be a possible reason: The map must be round and of a certain size that near the edge (0 column) of the map two huts occupy the same position (just like two cities share one square). When your unit enters the square one of the huts is opened but another is still there. As far as you don't move the unit out, next time when another unit enters the square the first hut get opened again so you have unlimited huts.

I don't think this is a cheat, simply a design program flaw -

Murgatroyd

I recently encountered this settler/city anomoly. I've only seen it the one time, and I've not tried to reproduce the results, but if anyone has the inclination to try to pin this down, here's what happened.

In a multiplayer game, I was trying to found a city, with a settler, on a mountain square. I pressed the "B" button to found the city and waited. There's usually a couple second wait while the city is founded, but this time the "lag" turned out to be a complete disconnection from the host. I notified the host that I had "hung up", and was instructed to hot join. Upon re-entering the game, I was met with a new city, PLUS my settler was in the city. (An additional note: I believe I already had an archer fortified on the mountain square, as well.)

• If it is impossible for your troop (by ZOC) to move in a certain direction, the games shows you all troops that makes the move impossible on the map. Even cities will be shown!
  That means: You have a AI troop standing adjunct you. Try to move to a place that is also on it's neighborhood. If there is a second troop, that stand adjunct this second place, it will pop up on screen. Even out of the black. Also you can see the terrain, where it stands on. Same with cities.

• One thing that was changed from civ1 to civ2, that I don't like (all these other changes I really like ), is, if you unload the troops out of a ship they lost only 1 move for that. Therefore you can use the 2nd move, say of a Dragoon, to attack a city. This makes them even more powerful than the marines, which was, IMHO, constructed for shore attack. More, because on that way you also able to attack cities that aren't at shore's, but even one square behind them.
  In civ1 it was a great challenge for me to establishing a "bridgehead" on a new country (D-Day like). In addition with this possibility barbarians/raiders with dragoons on boards was a danger, that can't be avoid. (Strange thing I saw one time, maybe a program error: I've got raiders spring out of a little see (one ocean square surrounded completely with land terrain) right in the middle of my thick continent: That can't performed by any AI opponent! )