Barbarian Attack (in general) - When determining which player has the most victory points, is each captured barbarian counted as half a victory point?

Traders & Barbarians

Two captured barbarians are worth one victory point, but a single barbarian initially has no value for a player. In a combination with Cities & Knights or The Fishermen of Catan, this means that whenever you can play cards (Master Merchant and Wedding) against the leading player(s), they are not affected by it if a single captured barbarian provides them with half a virtual point more than you.

Barbarian Attack + C&K - How far away do you move a displaced knight?

Traders & Barbarians

His owner places him on the next free path.

Barbarian Attack + C&K - Is it prohibited to use gold for trading commodities when a 3:1 or 4:1 trade is performed?

Traders & Barbarians

Yes.

Barbarian Attack + C&K - May I use a Diplomat to move a road on which a knight stands?

Traders & Barbarians

Yes.

Barbarian Attack + C&K - May knights be moved past foreign knights, settlements, and cities?

Traders & Barbarians

Yes.

Barbarian Attack + Seafarers (in general) - Is a trade route interrupted if a settlement that represents the only connection between road and ship route is conquered?

Traders & Barbarians

The conquered settlement still exists. The trade route is interrupted, that is, only the road segments or the ships count toward the Longest Trade Route. However, the ship and the road segment adjacent to the settlement are not “open.”

Barbarian Attack - Do you leave the remaining knights at their current hexes or move them back to the castle hex?

Traders & Barbarians

The knights remain at their current hex. Furthermore, they may immediately intervene in the next battle if there are more knights than barbarians at an adjacent hex.

Barbarian Attack - If there are multiple battles against the barbarians, do you first fight all battles and then determine the losses, or do you determine the losses immediately after each battle?

Traders & Barbarians

After each battle, you immediately determine which knights didn't withstand the battle. A knight wounded in a battle can't participate in another battle.

Barbarian Attack - May I resolve the phases “Move your knights” and “Expel the barbarians” in any order, perhaps also simultaneously?

Traders & Barbarians

No. First you have to move all knights, then all the battles take place.

Barbarian Attack - May I use the Treason card to place the two barbarians on hexes in the island's interior?

Traders & Barbarians

No. Barbarians may only be placed on coastal hexes.

Barbarian Attack - Once a knight development card is played and a knight is placed at the castle hex, can the player immediately move the knight away from the castle hex or does he/she need to wait one full turn before moving the knight?

Traders & Barbarians

A knight placed at the castle hex must be moved immediately; to do this, however, you have to wait until the end of your turn. You can move your knights after you have finished trading and/or building. Knights you just placed at the castle hex must be moved.

Catan Event Cards (Earthquake) + C&K - May I build a knight adjacent to a damaged road?

Traders & Barbarians

Yes.