Partner has opened 1♥ or 1♠ and you do not have a fit (0–2 cards in their suit). Choose your response:

• 0–5 HCP → Pass
• 4+ card suit at the 1 level (6+ HCP) → bid longest (hi-5, 4-lo)
  Over 1♥: only 1♠ is available. Over 1♠: nothing at the 1 level.
• No 1-level suit, 6–9 HCP → 1NT
• 10+ HCP, 4+ card suit at 2 level → bid longest (hi-5, 4-lo)
  Note: 2♥ over 1♠ requires 5+ hearts.