Defense against special openings

Multi 2D (Weak 2 in a major or strong hand) OR

Wilkosz 2D (5+5+ with at least one major suit) OR

Flannery 2D (45xx) OR Precision 2D (4414/4405) OR

Ekren 2D (4+4+ in majors)

• DBL: Takeout, 15+
  
• New suit: natural, non-forcing, 15+ if at level 3
  
• 2NT: 16-18, balanced, stoppers. Continuation as after 2NT opening.
  
• Pass followed by a bid: less than 15 HCP
  

Weak 2 OR

Dutch 2H/S (5+4+ in hearts/spades and a minor suit)

• DBL: Takeout. If opponent passes:
• 2NT (Lebensohl): Relay to 3C usually with a weak hand
• New suit: Natural, 8+ HCP
• Cue-bid: No stopper, 4 cards in other major
• 3NT: No stopper, 3 or fewer cards in other major
• Suit: Natural
• 2NT: Strong, balanced. Continuation as after 2NT opening.
• Cue-bid: Asking for stopper. Same developments as after 1H/S-3H/S cue-bid
• Jump cue-bid: 5+5+ in minors, control in the opening suit
• 4NT: 5+5+ in minors, no control in the opening suit
• 4C/D: 5+ clubs/diamonds and 5+ in the other major

2NT with both minors

• DBL: 15+ HCP, balanced or semi-balanced
• 3C: Hearts
• 3D: Spades
• 3H/S: Competitive
• 3NT: Strong balanced

Flannery 2H (45xx) OR

Ekren 2C/D/H/S (4+4+ in the opening suit and another suit)

• DBL: Optional
• Suit: Natural
• 2NT: Strong NT. Continuation as after 2NT opening.
• Lower (if known) cue-bid: Natural – to play
• Higher (or only) cue-bid: Game Forcing