21GF - 2/1 Game Force

Features:
  • 2/1 game forcing conditions:
      • partner opens 1, 1 or 1♠ in 1st or 2nd seat;
      • the next player passes;
      • the auctions are: 1♢-2♣ (optional semi forcing), 1-2♣, 1-2, 1♠-2♣ (at least 3-4-3-3), 1♠-2, 1♠-2 (5+);
      • responder has 13+ HCP;
      • responder’s suit is a 5+ cards long. Sometimes responder’s suit can contain 4 cards or even 3 cards (1♠-2♣),
  • the forcing notrump convention:
      • partner opens 1 or 1♠ in 1st or 2nd seat;
      • no interference;
      • no 4 spades after 1H opening;
      • 5-12 HCP (responder can have 3-support with 5-6 HCP or 10-12 HCP).

After 1♣ opening, responder commonly skips long diamonds suit if he has a 4-M. So 1♣ - 1 = no 4-card major.


Opener’s second bid after game forcing bid:

  • a minimum: Make a low-level rebid in your suit or notrump (1-2♣-2/2NT);
  • extra values: Make a jump (1-2♣-3/3NT), a reverse bid (1-2♣-2♠) or any bid at the 3-level (1-2-3♣, 3♢);
  • 18+ balanced: Rebid 2NT, then show your extra strength later (1-2♣-2NT-3NT-4NT);
  • other new-suit bids at the 2-level (1♠S-2♣-2/2) are natural, but don't define your strength.


Opener’s second bid after the forcing notrump:

  • 2♣/2♢ - 3+, 12 -16 HCP;
  • 2♡ (after opening 1♠) - 3+, 12 -16 HCP;
  • 2♠ (after opening 1) - 3+, 17+ HCP;
  • 2♡/2♠ - 6+, 12 -16 HCP;
  • 2NT - 17-18 HCP;
  • 3♣/3♢ - 4+, 19+ HCP;
  • 3♡ (after opening 1♠) - 4+, 19+ HCP;
  • 3♡/3♠ (opening suit) - 6+, 16+ HCP;
  • 3NT - 19+ HCP;
  • 4♡/4♠ (opening suit) - 7+, 16+ HCP or 8+, 13+ HCP.