Inviting 2M
Bidding after 2M implies invitational+ since 2M is already an appealing contract.
| 1♣ - 1M - 2M - | |
|---|---|
| 2NT! | INV+, no longer side suits |
| 3♣♦ | INV, 5+# |
| 3M! | LIM, (4333) |
| 3NT | COG, (4333) |
| 4♣♦! | S/T SPL, 0–1# |
As the highest step of invitation, 3M should be very specific. I choose (4333) to enable choice of games between 3NT and 4M.
Why bother bidding another suit to 2M? It helps finding double fits.
| 1♣ - 1♥ - 2♥ - | |
|---|---|
| 2♠ | INV, 4+♠, 5+♥ |
| 3♠! | S/T SPL, 0–1# |
| 1♣ - 1♠ - 2♠ - | |
|---|---|
| 3♥ | INV, 4+♥, 5+♠ |
| 4♥! | S/T SPL, 0–1# |