The next era needs a mix of buildings, and one building must not fill two slots

To enter a new age the player must own, say, three kinds of buildings, each slot accepting a few alternatives. Counting each slot on its own lets one building tick two boxes, and the player enters the age while missing something. This entry shows how to match buildings to slots correctly and why the age, once won, is never lost again.

Why this works

A requirement like three different things means three separate, matching pairs, and one object can only stand in one place. Giving up a choice early can block a later slot, so the check must be willing to rearrange. A reached era is a fact earned, not a state to recompute.

When not to use it

Skip it when the requirement is simply a total, such as a number of buildings of any kind, or when each slot accepts exactly one fixed kind. Plain counting is then enough and easier for players to follow.

In the full entry

• What to build, step by step
• Starting values and the reason for each
• 4 common mistakes and the fix
• 32 lines of example code with 4 checks that pass
• How your AI shows you that it works

Say this to your AI

Use the Spielerando entry "The next era needs a mix of buildings, and one building must not fill two slots" (read_entry next-era-needs-a-set-of-buildings-without-counting-one-twice) in my game. Build it step by step, and show me how you checked that it works.

Or skip this and connect the MCP: your AI then finds all of this by itself.Connect the MCP