Redundancy Dependencies

From Freeciv

Redundancy applies to effects. It should not prevent you from building something. Currently we do not allow players with a Great Wall wonder to build City Walls for e.g., when we should. It may be a good idea to provide detailed information on effects to the user so they will not build redundant effects. But if the player wants to build it even if it is made 100% redundant by something that supposedly has a "perpetual" effect, you should not forbid him to.

You should also be able to build a Hydro Plant without destroying your Power Plant first. Then the best effect in the redundant group wins. IIRC Civ I did things this way.

The player knows best. For e.g. he could know that he will lose that "perpetual" wonder and has to start building alternatives before that happens, while he still can.