2C: Strong Multi

• 2D: The usual bid
• 2H/S: 5+ suit, 18+ HCP or 4 quick losers
• 2NT: 20-21 HCP, balanced (see 2NT opening for the developments)
• 3C/D: 6+ 1-suiter, 18+ HCP or 4 quick losers
• 3H/S: 7+ suit, 15-17 HCP, 8 or 8.5 tricks
• 3NT: 5+5+ in majors or in minors
• 4C/D: 5+5+ in the suit and a major
• 4H/S: 8+ suit, 8.5 or 9 tricks
• 2H/S: 5+ suit, sign-off
  
• 2NT: 6+ minor suit, sign-off
  
• 3C/D/H/S: KQ10xxx or KQJxxx suit and nothing else
• 3NT: AKQxxx suit and nothing else

Responses after opponent's DBL

• Pass: The usual bid
• RDBL: Let's play 2C
• 2D/H/S: 5+ suit, sign-off
• 2NT: 10+, balanced, stoppers in opponent's suit(s)
• Other: Unchanged

Responses after opponent's over-call

• Pass: Weak
• DBL: Some strength
• Other: Natural (i.e. 2H/S is competitive)