Opening 2♦ means pre-emptive 6 cards major suit, 5-10 HCP. Responder options:
- PASS – weak hand with diamonds, no fit in ♥ or ♠
- 2♥ – opener should PASS with ♥, or correct to ♠
- 2NT – Ogust
- 3♣ – 3♦ is relay, after which responder bid strong one suited hand
- 3♦ – fit in both major, invite to game. Opener accept by double Texas: 4♣ = Hearts, 4♦ = Spades
- 3♥ – opener should PASS with ♥, or bid 3♠
- 3♠ – opener should PASS with ♠, or bid 4♥
- 3NT – to play
- 4♣ – artificial, asking opener to bid transfer to his major suit
- 4♦ – artificial, asking opener to bid his major suit