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;

    • 5-6 HCP, 3 card support, good shape;

    • 7-9 HCP, no support;

    • 10-12 HCP max 3 card support.

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+ HCP 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;

• 15-17 HCP and 5=M - rebid 3NT.

Opener’s second bid after the forcing notrump 1♥ - 1NT:

• 2♣/2♦ - 3+, 11 -18 HCP;

• 2♥ - 6+, 12 -16 HCP;

• 2♠ - 4+, 17+ HCP;

• 2NT - 16-18 HCP;

• 3♣/3♦ - 4+,  19+ HCP;

• 3♥ - 6+, 16+ HCP;

• 3♠ - 

• 3NT - 19+ HCP;

• 4♥ - 7+, 16+ HCP  (8+, 13+ HCP).

Opener’s second bid after the forcing notrump 1♠ - 1NT:

• 2♣/2♦ - 3+, 11 -18 HCP;

• 2♥ - 4+, 11 -18 HCP;

• 2♠  - 6+, 12 -16 HCP;

• 2NT - 16-18 HCP;

• 3♣/3♦ - 4+,  19+ HCP;

• 3♥ - 4+, 19+ HCP;

• 3♠ (opening suit) - 6+, 16+ HCP;

• 3NT - 19+ HCP;

• 4♠ - 7+, 16+ HCP (8+, 13+ HCP).