Bridge

2♦

bid
2♦
2♦
promises
  • 6-card diamond suit
  • 5-10 HCP
conditions
5–10 HCP, D:6–6
why

A weak two takes up a level of bidding before opponents can describe their hands — cheap for you, expensive for them.

what happens next

Partner passes with no game interest, raises to preempt further, bids 2NT as a feature ask, or bids a new suit forcing.