1NT over 1-Level Suit Opener

• balanced hand
• full stopper in opener's suit
• 15-18 HCPs
  
  
• Bid Strong Double w/ 19+ pts

Responses by Advancer:

• R:2C - Stayman for majors
  • R:cue bid - Stayman for majors (alternative to 2C)
• A:other - natural responses

2NT over 1-Level Suit Opener

• Unusual 2NT