Principle

OR 20-22, B

OR 16+, 8(NV)/9(V) tricks, semi-gameforcing

OR 7-10(11) (no opening) with 5+4+ in both ♥♠

Answers

/2♣

- 2♦: ambiguous relay (weak or limit), asks which 5+card, F1, *ALERT*

/2♥♠: opener bids the 5+card suit, NF

- PASS: 0-11 (weak), no preference for ♥ or ♠, DIF<2 (♥ is max 1 card longer than ♠ or vice versa)

- 3♣♦: 0-11 (weak), missfit in M (0/2 M's), 5+♣♦

- 2SA: 12-14 (limit), no ♥♠-fit

- 3♥♠: 12-14 (limit) with 4+♥♠, asks for strength, NF

/PASS: 7-8, minimal

/4♥♠: 9-11, maximal, game

- 2♥♠: weak with DIF=2+, NF

- 3♥♠4♥♠: 0-11, 4+card in ♥♠, Total Number of Tricks must be OK, barrage

- 2SA: strong, 15+, F1, asks for which M AND extra length

/3♣: 5-♥ 4-♠

/3♦: 5-♠ 4-♥

/3♥: !!! 6-♠ 4-♥ inverted -- strong hand plays

/3♠: !!! 6-♥ 4-♠ inverted -- strong hand plays

/3SA: 5-♥ and 5-♠

- 3♣♦: 15+, missfit in M (0/2 in both M's), own strong uni-color 6+♣♦, F1

A strong opener

with a strong hand, opener will bid 2NT (B) or jump in a suit (unicolor)

/2♣

- 2♦♥♠

/2SA: it's a 20-22 hand, now we play Niemeijer, NF

/3♣♦♥♠: 5+card in ♣♦♥♠, 16+, 8/9 tricks, NF

Note: a strong opener who has been answered -2NT (strong), still has to jump:

/2♣ - 2NT - 4♦: 16+, 5+♦, 8/9 tricks