Negative double

Negative double:
  • after 1♣ – (1♦) – X shows 4+♥ i 4+♠;
  • after 1m – (1♥) – X shows exactly four spades;
  • after 1m – (1♠) – X shows at least four hearts – not exactly four hearts;
  • after 1M – (2m) – X shows at least four cards in the other major;
  • after 1♦ – (2♣) – X shows at least one major at least four cards long;
  • after 1♥ - (1♠) or 1♠ - (2♥), the negative double shows 4+♣ i 4+♦.