CATAN
Can you hand a resource to another player for nothing by splitting it across two trades, or by trading one way and then using a harbour?
Repliers split on whether a chain of legal-looking trades can move a card for nothing, and no ruling settles it.
Disputed. The rules forbid giving cards away, and the stronger view is that a chain of trades meant to net a free card is not allowed. A minority argues that each trade is a legal exchange on its own, so the sequence is a loophole, and some groups allow it as a house rule.