CATAN
Can you show your hand to prove you have none of a needed resource?
The rulebook keeps hands hidden but does not address proving your hand, and only one post speaks to it.
- CATAN rulebook · Rulebook · Setting Up the Game
- Shade_Jon · Community · 2005-08-02
No. The rulebook has each player keep resource cards hidden in hand and gives no way to reveal them to prove a point, so you can only tell the other player what you hold, and they decide whether to believe you.