Competitive bidding
1NT (X)
I suggest Terrorist’s runout regardless of what (X) means. This runout also applies to a conventional double, yet responder can also pass balanced hands more often.
| 1NT (X) | - |
|---|---|
| XX | PEN |
| 2♣! | P/C, 5+♣ or 4+♦ 4+♠♥ |
| 2♦! | P/C, 5+♦ or 4+♠ 4+♥ |
| 2M | NF, 5+# |
| 2NT! | CUE, good unbalanced hand |
| 3X | PRE, 6+# |
Opener often runs with clubs because it is hard for responder to do so.
| 1NT (X) P | - |
|---|---|
| XX | 5+ suit |
| 2♣! | 4+♣, 4+ another suit |
1NT (2♣)
Systems on is a decent approach over 1NT (2♣︎). The overcall is somewhat ignored, and X replaces the stolen bid of 2♣. Since continuations to 1NT is major suit oriented, it is crucial if (2♣) shows a major suit.
(2♣) shows both majors
This kind of 2♣︎ requires extra care. I recommend BTU vs Unusual.
| 1NT (2♣) | Both majors |
|---|---|
| X | PEN for either major |
| 2♦ | NF, 5+♦ |
| 2♥! | FG, 5+♦ |
| 2♠! | INV+, 5+♣ |
| 2NT! | LEB, PRE 6+♣ or FG (xx)45 |
| 3♣♦ | INV, 6+# |
| 3♥♠! | Ask for stopper in this suit |
(2♣) specifies one major
This position is analogous to (1M) 1NT. X replaces the Gladiator 2♣.
(2♣) specifies no major
Ignore the (2♣) overcall. X replaces the Stayman 2♣ as usual.
1NT (2♦♥♠)
Rubinsohl covers these auctions.
1NT (2NT)
BTU vs Unusual suffices.
| 1NT (2NT) | 5+♦, 5+♣ |
|---|---|
| X | PEN |
| 3♣! | INV+, 5+♠ |
| 3♦! | INV+, 5+♥ |
| 3♥♠ | NF, 5+# |
| 3NT | S/O |
| 4♣! | Choice of games, 4+♠, 5+♥ |