Difference between revisions of "User:Brian/Bridge/Subsequent bidding after an inverted minor raise"

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(Created page with "Inverted minor raises are alertable. A raise of the minor implies that no major suit fit can exist, so the partnership must play in either the minor suit or notrump. With stop...")
 
 
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Inverted minor raises are alertable. A raise of the minor implies that no major suit fit can exist, so the partnership must play in either the minor suit or notrump. With stoppers in all suits, a 3NT game is preferable to a 5m game, since making a 5m contract requires additional strength.
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Inverted minors is a system in which a single raise of opener's minor is strong while a jump raise is weak. That is, 1♦ - 3♦ shows a weaker hand (on responder's part) than 1♦ - 2♦. This is the opposite of major suit raises, where a jump raise is stronger than a single raise.
  
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==Stopper-bidding sequences==
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The reason why many partnerships play minor raises inverted is that minor suit contracts are not actually the most desirable. Even with a minor suit fit, notrump is often preferable. By making the strong raise only a single raise, bidding space is conserved so the partnership can figure out whether or not to play in notrump. Specifically, a raise of the minor implies that no major suit fit can exist, so the minor suit and notrump are the only two options. With stoppers in all suits, a 3NT game is preferable to a 5m game, since making a 5m contract requires additional strength. Therefore, following an inverted minor raise, one partner or the other usually initiates stopper-bidding to determine whether notrump is viable.
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In order to determine whether a notrump game is advisable, partners bid stoppers up the line. Once stopper-bidding has commenced, rebids by either partner are as follows:
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* With game-going strength and all remaining suits stopped, one signs off in 3NT.
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* With all remaining suits stopped but not knowing whether one has enough strength for 3NT, one bids 2NT. Partner then signs off in 3NT with enough strength, or 3m otherwise.
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* Otherwise, one either bids a stopper they have in a remaining suit (allowing partner to continue bidding stoppers up the line) or signs off in the agreed minor, whichever is cheaper.
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==Opener's rebids==
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==Meanings of subsequent bids==
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My partner single-raised my minor, I have a minimum (13- HCP), and partner is a passed hand → Pass.
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If you are opener, you must alert your partner's raise.
  
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My partner single-raised my minor, I have a minimum (13- HCP), and partner is an unpassed hand → Respond 3m. Subsequent bids by partner show are stopper-showing (see below) and indicate game-forcing strength (14+ HCP).
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After a double raise by responder, you should pass. Remember that a double raise can be made with a very weak hand. If you think 3NT is worth investigating now despite partner's potentially very weak hand, shouldn't you have opened [[User:Brian/Bridge/Opening bids|2♣ or 2NT]] originally instead of 1m?
  
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My partner single-raised my minor, I have 14–15 HCP, and stoppers in the other three suits → Rebid 2NT, invitational to 3NT.
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{| class="wikitable"
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|+Opener's rebids after a single raise
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|-
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! If... !! then...
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|-
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| I have a minimum (12- HCP), and partner is a passed hand
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| Pass. Some partnerships have an agreement that the single raise is one-round forcing, but in this particular circumstance it really makes no sense to continue bidding—with a minimum hand opposite an invitational hand, 3NT is out of the picture, and rebidding 3m has no potential upside, not even preemptive value given that both opponents have passed.
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|-
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| I have a minimum (12- HCP), and partner is an unpassed hand
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| Rebid 3 of your minor. (Since 2NT has now been bypassed, any subsequent stopper-showing bid by partner indicates enough strength for 3NT.)
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|-
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| I have 13–14 HCP with stoppers in all side suits
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| Bid 2NT. Partner will sign off in either 3m or 3NT depending on strength.
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|-
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| I have 15+ HCP with stoppers in all side suits
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| Sign off in 3NT.
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|-
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| I have extra strength (15–18 total points) with a void or small singleton in a side suit and stoppers in the other two side suits
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| Make a [[User:Brian/Bridge/Splinter|splinter bid]]. Exception: avoid splintering in clubs since bidding 4♣ makes it impossible to sign off in 3NT.
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|-
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| I have a maximum (19+ total points)
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| TODO: how to do minor-suit slam bidding?
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|-
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| I have a side suit stopper but I don't have all three side suits stopped.
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| Initiate stopper-bidding as described below.
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|-
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| Otherwise (I don't have any side suit stoppers)
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| (TODO: Can responder make an inverted minor raise if they have all three side suit stoppers?)
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|}
  
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My partner single-raised my minor, I have 16+ HCP and stoppers in the other three suits → Rebid 3NT, to play.
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{| class="wikitable"
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|+Responder's rebids
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|-
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! If... !! then...
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|-
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| Partner rebid 3NT after my raise
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| Pass.
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|-
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| Partner rebid 2NT after my raise and I have 12+ HCP
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| Raise to 3NT, since partner's 2NT rebid shows 13–14 HCP.
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|-
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| Partner rebid 2NT after my raise and I have 11- HCP
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| Sign off in 3m.
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|-
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| Partner bid a new suit after my double raise
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| See below on how to participate in stopper-bidding.
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|-
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| Partner jump-shifted after my single raise
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| This is a [[User:Brian/Bridge/Splinter|splinter bid]]; respond accordingly.
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|-
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| Partner bid a new suit after my single raise
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| See below on how to participate in stopper-bidding.
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|-
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| Partner rebid 3m and I have 14+ HCP with all the side suits stopped
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| Sign off in 3NT.
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|-
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| Partner rebid 3m and I have 14+ HCP with at least one side suit stopped
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| Initiate stopper-bidding (see below).
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|-
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| Partner rebid 3m and none of the above are true
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| Pass. (TODO: What if responder has slam interest?)
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|}
  
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My partner single-raised my minor, I have 15- HCP and stoppers in the other three suits →
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==Stopper-bidding sequences==
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In order to determine whether a notrump game is advisable, partners bid stoppers up the line. Once stopper-bidding has commenced, rebids by either partner are as follows:
  
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...
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{| class="wikitable"
 +
! If... !! then...
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|-
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| My partner returned to the agreed minor
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| Pass. Partner is telling you that the partnership is missing one or more side-suit stoppers so you do not belong in notrump.
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|-
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| My partner bid 2NT, but I know that we have enough strength for game.
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| Raise to 3NT, since partner's bid of 2NT means they believe all side suits are stopped.
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|-
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| My partner bid 2NT, but I don't have enough strength to force to game.
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| Sign off in 3 of the agreed minor.
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|-
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| My partner bid a side suit, bypassing a suit in which I also have no stopper. (For example, 1♣ - 2♣ - 2♥ denies a diamond stopper.)
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| Sign off in the agreed minor at the cheapest available level, since partner has just denied a stopper in the bypassed suit.
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|-
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| My partner bid a side suit and I now know that we have all suits stopped.
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| Sign off in 3NT if you know the partnership has enough strength; otherwise bid 2NT. Partner's subsequent raise to 3m or 3NT is to play.
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|-
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| My partner bid a side suit, I have game-forcing strength, and I don't yet know whether all suits are stopped.
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| Bid the cheapest available suit in which you have a stopper you haven't shown yet, letting partner you have that suit stopped.
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|-
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| My partner bid a side suit, I don't yet know whether all suits are stopped, and I also don't know whether we have enough strength for game.
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| Bid your cheapest available stopper if you can do so without bypassing 3m. If you cannot do so, then sign off in 3m.
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|}

Latest revision as of 07:59, 20 June 2017

Inverted minors is a system in which a single raise of opener's minor is strong while a jump raise is weak. That is, 1♦ - 3♦ shows a weaker hand (on responder's part) than 1♦ - 2♦. This is the opposite of major suit raises, where a jump raise is stronger than a single raise.

The reason why many partnerships play minor raises inverted is that minor suit contracts are not actually the most desirable. Even with a minor suit fit, notrump is often preferable. By making the strong raise only a single raise, bidding space is conserved so the partnership can figure out whether or not to play in notrump. Specifically, a raise of the minor implies that no major suit fit can exist, so the minor suit and notrump are the only two options. With stoppers in all suits, a 3NT game is preferable to a 5m game, since making a 5m contract requires additional strength. Therefore, following an inverted minor raise, one partner or the other usually initiates stopper-bidding to determine whether notrump is viable.

Meanings of subsequent bids[edit]

If you are opener, you must alert your partner's raise.

After a double raise by responder, you should pass. Remember that a double raise can be made with a very weak hand. If you think 3NT is worth investigating now despite partner's potentially very weak hand, shouldn't you have opened 2♣ or 2NT originally instead of 1m?

Opener's rebids after a single raise
If... then...
I have a minimum (12- HCP), and partner is a passed hand Pass. Some partnerships have an agreement that the single raise is one-round forcing, but in this particular circumstance it really makes no sense to continue bidding—with a minimum hand opposite an invitational hand, 3NT is out of the picture, and rebidding 3m has no potential upside, not even preemptive value given that both opponents have passed.
I have a minimum (12- HCP), and partner is an unpassed hand Rebid 3 of your minor. (Since 2NT has now been bypassed, any subsequent stopper-showing bid by partner indicates enough strength for 3NT.)
I have 13–14 HCP with stoppers in all side suits Bid 2NT. Partner will sign off in either 3m or 3NT depending on strength.
I have 15+ HCP with stoppers in all side suits Sign off in 3NT.
I have extra strength (15–18 total points) with a void or small singleton in a side suit and stoppers in the other two side suits Make a splinter bid. Exception: avoid splintering in clubs since bidding 4♣ makes it impossible to sign off in 3NT.
I have a maximum (19+ total points) TODO: how to do minor-suit slam bidding?
I have a side suit stopper but I don't have all three side suits stopped. Initiate stopper-bidding as described below.
Otherwise (I don't have any side suit stoppers) (TODO: Can responder make an inverted minor raise if they have all three side suit stoppers?)
Responder's rebids
If... then...
Partner rebid 3NT after my raise Pass.
Partner rebid 2NT after my raise and I have 12+ HCP Raise to 3NT, since partner's 2NT rebid shows 13–14 HCP.
Partner rebid 2NT after my raise and I have 11- HCP Sign off in 3m.
Partner bid a new suit after my double raise See below on how to participate in stopper-bidding.
Partner jump-shifted after my single raise This is a splinter bid; respond accordingly.
Partner bid a new suit after my single raise See below on how to participate in stopper-bidding.
Partner rebid 3m and I have 14+ HCP with all the side suits stopped Sign off in 3NT.
Partner rebid 3m and I have 14+ HCP with at least one side suit stopped Initiate stopper-bidding (see below).
Partner rebid 3m and none of the above are true Pass. (TODO: What if responder has slam interest?)

Stopper-bidding sequences[edit]

In order to determine whether a notrump game is advisable, partners bid stoppers up the line. Once stopper-bidding has commenced, rebids by either partner are as follows:

If... then...
My partner returned to the agreed minor Pass. Partner is telling you that the partnership is missing one or more side-suit stoppers so you do not belong in notrump.
My partner bid 2NT, but I know that we have enough strength for game. Raise to 3NT, since partner's bid of 2NT means they believe all side suits are stopped.
My partner bid 2NT, but I don't have enough strength to force to game. Sign off in 3 of the agreed minor.
My partner bid a side suit, bypassing a suit in which I also have no stopper. (For example, 1♣ - 2♣ - 2♥ denies a diamond stopper.) Sign off in the agreed minor at the cheapest available level, since partner has just denied a stopper in the bypassed suit.
My partner bid a side suit and I now know that we have all suits stopped. Sign off in 3NT if you know the partnership has enough strength; otherwise bid 2NT. Partner's subsequent raise to 3m or 3NT is to play.
My partner bid a side suit, I have game-forcing strength, and I don't yet know whether all suits are stopped. Bid the cheapest available suit in which you have a stopper you haven't shown yet, letting partner you have that suit stopped.
My partner bid a side suit, I don't yet know whether all suits are stopped, and I also don't know whether we have enough strength for game. Bid your cheapest available stopper if you can do so without bypassing 3m. If you cannot do so, then sign off in 3m.
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