A double used conventionally to ask partner to bid his best suit. Traditionally a double is for take-out if it is:
1. Of a suit bid at the one- or two- level.
2. Made at the first opportunity to double that suit.
3. Made before partner has bid.
In each of these example sequences, the double is for take-out. In the third example, the second round was West’s first chance to double hearts. A hand consistent with all of them is:
