Playing a game where there were a lot of quest locations that happened to block choke points, Pioneers by themselves couldn't move onto or through the quest locations. If I stacked them with a champion then the stack could get past without an issue.
And sometimes those choke points can be blocked by level 9 champions. Then you can't get through until you research the tech that lets you hire them and have several hundred gold to do it with. Also a problem for roads that get build through them.
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