Principle

IDAK = Instant Death And Kill

After a strong enemy (/1♣) opening (16+), we immediately intervene with 0-11, and PASS when very weak or 12+.

5+cards are bid in transfer, while 4-4-hands are bid on the 2-level.

Examples

(/1♣)

- PASS: very weak or 12+

all of the following bids are 0-11:

- X: 5+♦

- 1♦: 5+♥

- 1♥: 5+♠

- 1♠: no 5+card (partner can now end in 1NT himself)

- 1NT: 5+♣

- 2♣: 4-♣ & 4-♥♠ (partner can reply 2♦ to ask for the 4+M in ♥ or ♠)

- 2♦: 4-♦ & 4♥

- 2♥: 4-♥ & 4-♠

- 2♠: 4-♠ & 4-♦

- 2NT: 4-♣ & 4-♦