The single raise (i.e. 1:2
and 1
:2
) is forcing for one round. The requirements are:
Responder will often be unbalanced, since he can make notrump responses with balanced hands.
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Conversely, the requirements for a weak jump raise (i.e. 1:3
or 1
:3
) are:
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Rebid | Meaning |
---|---|
2![]() | Natural, 4+ cards. Implies imbalanced shape since opener could rebid no-trumps with 2-3-4-4 or 3-2-4-4. Forcing. |
2![]() ![]() | Natural, 3+ cards. Some experts play this as stopper-showing only. Forcing. |
2NT | Balanced 12-14 HCP. Not forcing. (Note: If playing weak no-trumps, this would show 15-17 HCP instead.) |
3![]() | Natural with a 5+ card suit. Not forcing. |
3![]() | Natural, minimum with a 4+ card suit. Forcing. |
3NT | Balanced 18-19 HCP. |
Rebid | Meaning |
---|---|
2![]() ![]() | Natural, 3+ cards. Some partnerships treat this as stopper-showing only. Forcing. |
2NT | Balanced 12-14 HCP. Not forcing. (Note: If playing weak no-trumps, this would show 15-17 HCP instead.) |
3![]() | Natural with a 4+ card suit. Probably imbalanced shape. Forcing. |
3![]() | Natural, minimum with a 5+ card suit. Not forcing. |
3NT | Balanced 18-19 HCP. |
In competition, inverted minors are off for most partnerships. A single raise is weak with 4-card support, and a jump raise is weak with 5+ card support.
If the opponents have doubled for takeout over /
,
If the opponents have made a natural suit overcall over /
,
Because inverted minors use 0-6 points for weak raises and 10+ points for strong ones, responder will sometimes be stuck for a bid with 7-9 points. These hands, which would traditionally make a single raise, can no longer do so. The typical approach is to respond 1NT even with unbalanced shape.
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Inverted minors were originally part of the Kaplan-Sheinwold bidding system that employed 5-card majors and a 12-14 1NT. Although intended to be used with a weak no-trump, inverted minors are compatible with any 1NT range.
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