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Natural 1♦-1M

The responses 1♦-1♥♠ show 4+ cards just like most natural systems.

1♦-1♥4+♥
1♠4+♠
1NTBAL MIN, 4–5♦
2♣MIN, 4+♣
2♦MIN, 6+♦
2♥MIN, 4+♥
2♠!MAX, 6+♦, ♦AJT+ or 7+♦
2NT!MAX, 6=♦, ≤ ♦AJ9
3♣MAX, 5+♣
3♦!MAX, 6+♦, 3=♥
3♥MAX, 4+♥, 5+♦
1♦-1♠4+♠
1NTBAL MIN, 4–5♦
2♣UNBAL, 3+♣
2♦MIN, 6+♦
2♥4+♥, 5+♦, MAX or 3451
2♠MIN, 4+♠
2NT!MAX, 6+♦, 0–2♠
3♣MAX, 5+♣
3♦!MAX, 6+♦, 3=♠
3♠MAX, 4+♠, 5+♦

BTU 3-way checkback

We use BTU-style 3-way checkback to an XYZ auction. There are 3 artificial relays in the 3-way checkback:

  • 2♣: several variants:
    • to play 2X
    • strongly shaped invitation
    • balanced invitation or choice of games
  • 2♦: game-forcing checkback, usually a choice of games
  • 2NT: transfer to clubs

As a corollary, natural 2X are wide-range invitations and 3X become slam tries.

1♦-1♥-1♠

1♦-1♥ 1♠-4+♠
1NTMIN, 0–3♠, 4–5♥, 0–3♦
2♣!BTU CB, F1
2♦!FG CB
2♥INV, 5+♥
2♠INV, 4+♠
2NT!TRF, PRE or FG, 6+♣
3♣S/T, 5+♣, 5+♥
3♦S/T, 4+♦, 5+♥
3♥S/T, 6+♥
3♠S/T, 4+♠
1♦-1♥ 1♠-1NTNAT MIN
2♣NF, 4=♣
2♦NF, 6+♦
2♥INV, 3=♥
2♠INV, 5+♠, 6+♦
2NTNAT INV
3♣FG, 4=♣
3♦FG, 6+♦
3♥FG, 3=♥
1♦-1♥ 1♠-2♣BTU CB
2♦MIN
2♥MAX, 3=♥
2♠MAX, at most partial stop in ♣
2NTMAX, likely stop in ♣
3♣MAX, 4054
3♦MAX, 6+♦
1♦-1♥ 1♠-2♣ 2♦-MIN
2♥S/O, UNBAL 5+♥
2♠S/O, 4+♠
2NTBAL INV
3♣INV, 6+♣
3♦INV, 4+♦
3♥INV, S-SOL 6+♥
3♠INV, 4+♠, 5+♥

1♦-1♥-1NT

1♦-1♥ 1NT-BAL MIN
2♣!BTU CB, F1
2♣ 2♦P/C
2♣ 2♥MAX, 3=♥
2♦!FG CB
2♥INV, 5+♥
2♠INV, 4+♠
2NT!TRF, PRE or FG, 6+♣
3♣S/T, 5+♣, 5+♥
3♦S/T, 4+♦, 5+♥
3♥S/T, 6+♥
3♠!SPL, 0–1♠, 6+♥
4♣!SPL, 0–1♣, 6+♥
4♦FG, 4+♦, 6+♥
1♦-1♥ 1NT-2♣ 2♦-P/C
2♥S/O, 5+♥
2♠INV, 4+♠, 6+♥
2NTBAL INV
3♣INV, 6+♣
3♦INV, 4+♦
3♥INV, S-SOL 6+♥

1♦-1♠-1NT

1♦-1♠ 1NT-BAL MIN
2♣!BTU CB, F1
2♣ 2♦P/C
2♣ 2♥MAX, 4+♥
2♣ 2♠MAX, 3=♠
2♦!FG CB
2♥INV, 4+♥, 5+♠
2♠INV, 5+♠
2NTTRF, PRE or FG, 6+♣
3♣S/T, 5+♣, 5+♠
3♦S/T, 5+♦, 5+♠
3♥S/T, 5+♥, 5+♠
3♠S/T, 6+♠
3NT12–15, 4=♠
4♣!SPL, 0–1♣, 6+♠
4♦FG, 4+♦, 6+♠
4♥!SPL, 0–1♥, 6+♠
1♦-1♠ 1NT-2♣ 2♦-P/C
2♥MIN, 4+♥, 5+♠
2♠S/O, 5+♠
2NTBAL INV
3♣INV, 6+♣
3♦INV, 6+♦
3♥INV, 5+♥, 5+♠
3♠INV, S-SOL 6+♠

Reverses and Lebensohl

For a precise game try, we sacrifice 2NT as Lebensohl to park minimum hands.

1♦-1♠ 2♥-4+♥, 5+♦, MAX or 3451
2♠NF, 5+♠
2NT!LEB, non-FG
3♣!4SFG
3♦FG, 3+♦
3♥FG, 4+♥
3♠FG, 6+♠