Catan for Two

Two imaginary neutral players have settlements but never produce. Each turn you roll for production twice (the second roll must differ). Whenever you build a road or settlement, also build one for a neutral player (a road if a settlement won't fit). Trade tokens come from settlements on the desert (2) or coast (1) and from discarding a played Knight (2, once per turn); once per turn spend them on a Forced Trade (take 2 random cards, give back 2 of your choice) or moving the robber to the desert, costing 1, or 2 if you lead in visible VPs.