Bridge

1♦

bid
1♦
1♦
promises
  • • 13+ HCP
  • • diamonds longer than clubs (or 4-4 in the minors)
  • • no 5-card major
conditions
13+ HCP, D:3+, H:≤4, S:≤4, D>C
why

With 4-4 in the minors, 1♦ preserves the 1-level for partner to show a major cheaply. With genuine diamond length it is a natural opener.

what happens next

Partner bids a 4-card major up-the-line, 1NT with 6-10 balanced, or raises diamonds with 4+.

partner

Uncontested — what happens next if the opponent passes.

overcaller

Opponent interference at this turn.