Against multi 2D

This is the first of the ACBL's two recommended defenses against a Multi 2 opening bid.

Note that Multi defenses are geared toward defending a weak two, the most common hand type shown by a Multi opening.

In Direct Seat

When RHO opens a Multi 2, the conventional overcalls are as follows.

Overcall	Meaning
Double	A Takeout double of spades.
2	A Takeout double of hearts.
2	Natural, 5+ spades, non-forcing.
2NT	16-18 HCP, balanced. Systems "on" (Stayman, Jacoby transfers...).
3	Natural, 6+ clubs, non-forcing.
3	Natural, 6+ diamond, non-forcing.
3	Natural, 6+ hearts, non-forcing.
3	Natural, 6+ spades, non-forcing. Stronger than a simple overcall. A 4 response is a cuebid.
4	Leaping Michaels, showing 5+ clubs and a 5+ card major.
4	Leaping Michaels, showing 5+ diamonds and a 5+ card major.

After 2 - Pass - 2/

Bid	Meaning
Double	Takeout double.
2	Over an enemy 2 bid, this is natural, 5+ spades, non-forcing.
2NT	15-18 HCP, balanced. Systems "on".
3	Natural, 6+ clubs, non-forcing.
3	Natural, 6+ diamond, non-forcing.
3	Natural, 6+ hearts, non-forcing.
3	Natural, 6+ spades, non-forcing. Stronger than a simple overcall. A 4 response is a cuebid.
4	Leaping Michaels, showing 5+ clubs and a 5+ card major.
4	Leaping Michaels, showing 5+ diamonds and a 5+ card major.

After 2 - Pass - Pass

Bid	Meaning
Double	Takeout double of diamonds.

The bidding should be treated as if the opponents opened a weak two-bid in diamonds.

After 2 - Pass - 2 - Dbl - 2

This sequence occurs after partner makes a takeout double of hearts, but opener corrects to spades.

Bid	Meaning
Double	For penalties.
3	Natural, 6+ hearts, non-forcing.
3	Artificial, asking for a spade stopper. Without one, partner should bid his cheapest long suit.

After 2 - Pass - 2 - Pass - 2 - Pass - Pass

Bid	Meaning
Double	Takeout double of spades.

Against Strong 1C

(1C) - X strong hand
(1C) - 1D/1H/1S nature
(1C) - 1NT , single suit, 6+
(1C) - 2C, C+ higher suit
(1C) - 2D, D+ higher suit
(1C) - 2H, H+ S suit
(1C) - 2S, S suit
(1C) - 2NT, 5-5 minors


Only valid in direct seat after 1C opener

1NT opening

2C, stayman
2D/2H, transfer to H and S
2S/2NT, transfer to C and D
3C, Puppet
3D, 2 majors 5-5
3H, singleton H, 3S,minors 54 or 45
3S,  singleton H, 3S,minors 54 or 45
3NT,sign off
4C, modified minorwood on C
4D, modified minorwood on D
4H, 2 minors 5-5? TBD
4S, Gerber
4NT, quantative

Minorwood for 1NT, 2NT or 2C-2NT

After pd open 2NT or 2C-2NT.

3S is 5-5 minor. ask pd pickup one, maybe slam interest

4m is 6+m, minorwood and m as trump (or m as trump RKC)
     - 4D/H, bad hand
               -one level up is forced RKC
      - 4S,    14
      - 4NT, 30
      -5C，2KC no Q
      -5D,   2KC with Q
4H is 5-5 major slam interest

4S is 5-5 major no slam interest

4NT is quantitative. if opener is not minimal hand, bid 4 suit from lowest one

Duan Escape System after weak 1nt opening being doubled

If the opponents double (regardless of what the double means): Escape system based on DONT starts.

1、对手在任何位置加倍，下一家有责任叫出自己的五张套或者通过再加倍表示5张d或者c，没有叫出即意味着没有5+张套，同伴需要通过再加倍求救，启动基于DONT的Duan Escape。

2、No double, no escape，即使打4-2配将牌。

3、求救性质的再加倍后，已经确定自己和同伴都没有5张套，同伴应答如下：

1）2c：4张c以及另外一个4张套，3334牌型除外。后续应对如下：

Pass：至少2张c。若对手加倍，同伴只能pass，选择权归DONT应叫者，即有可能持2张c的那一方：

A.      Pass：表示3+c，接受2c dbl 定约，

B.      Rdbl：2张c，4(43)2牌型，确定4张S，同伴若没有4张S，叫出四张的2d/h，至少能找到4-3配将牌。

C.      2d：4张d，否认4张s，实际上牌型已经明了，即3442，同伴在d和H间选择即可。

D.      2H：4432，同伴在H和S间选择即可。

2）2d：4张d和一个4张高花(3343除外)，否认4张c，后续应对如下：

Pass：至少2张d。若对手加倍，同伴只能pass，选择权归DONT应叫者，即有可能持2张d的那一方：

A.     Pass：表示3+d，接受2d dbl 定约，

B.     Rdbl：2张d，4423或者4324牌型，确定4张S，同伴可以在2H和2S间选择至少能找到4-3配将牌。

3）2H:4-4双高套，同伴可以选择其一。同伴选择后，若对手加倍，同伴可以通过再加倍表示也是4-4双高套，DONT启动者可以选择2S，也可以选择pass。

        4、若1nt的应叫方为(4441)牌型，方法一样。2d/2H时可以找到4-4配，唯一区别是DONT启动者叫2c，而DON’T应叫者4441时，不等加倍，叫2d表示4441即可。若对手加倍，选择权在同伴。

2NT Relay over 1NT opening

1NT - 2NT		=要求开叫人叫接3C，没有例外.
3C		=Forced.
应叫人持下列两种牌之一：
1. 梅花套的弱牌。 应叫人持六张或更长的梅花及一手弱牌，当开叫人叫出3C后，应叫人将不叫。
2. 有满贯兴趣的三套牌（4441或5m440）。
	当开叫人叫出3C后，应叫人叫出单张或缺门。梅花单缺且仅有轻微的满贯兴趣时，再叫3NT；梅花单缺并有强烈满贯兴趣时，应叫人叫4C。
	开叫人可以止叫于44配高花，或在应叫人单缺花色上持有大量牌力时叫3NT，如果应叫人叫的是4C，开叫人在花上有浪费牌力将止叫于4NT。
	开叫人继续叫四阶低花，且为应叫人已经标明的套，这在确定将牌的同时用作关键张问叫[注:我们倾向于应叫方发起问叫]。

Minor Suit Stayman

Minor Suit Stayman is an extension of the Stayman and Jacoby Transfer conventions. If you play transfer bids over 1NT, then a 2response shows spades, thereby making a direct 2 response an idle bid. Playing Minor Suit Stayman, 2 becomes an artificial inquiry asking opener for a 4-card minor.

Opener	Responder
1NT	2

The 2 response to 1NT is artificial, showing:

• 5-4 shape or longer in the minors. 4-4 distribution is okay with strong hands interested in slam.
• Interest in game or slam. Minimum strength depends on the opening 1NT range. Opposite a strong 1NT, responder should have a minimum of 8 points.
• Denies a 4-card major. Otherwise, responder should use Stayman.

Responder's minor suit length may vary depending on the overall strength of his hand. With minimum strength, e.g. 8 points opposite a strong 1NT, responder should have at least 5-4 distribution in the minors. With interest in slam, responder need only be 4-4 in the minors.

Examples of Minor-Suit Stayman hands (opposite a strong 1NT opener):

A2 KJ2 KT98 AJ83

3 JT3 KT98 A9832

7 K2 KQ953 A8765

Opener's Rebids

After hearing 2 response, opener's rebids are as follows. Note that unlike regular Stayman, opener has some latitude in judging whether to reveal a 4-card suit. Specifically, opener is allowed to bid 3/ with a major suit control and a 4-card minor. This is because identifying a minor-suit fit may be less important than reaching a good 3NT contract.

Rebid	Meaning
2NT	Denies a 4-card minor. Implies stoppers in both major suits.
3	Shows 4+ clubs. With 4-4 shape in the minors, opener should bid 3.
3	Shows 4+ diamonds. (Denies 4+ clubs.)
3	Shows a heart stopper, and invites partner to bid 3NT with a spade control. Forcing. Opener may have a 4-card minor with highly balanced shape and strength, and merely looking to see if 3NT is the best fit.
3	Shows a spade stopper, and invites partner to bid 3NT with a heart control. Forcing. Opener may have a 4-card minor with highly balanced shape and strength, and merely looking to see if 3NT is the best fit.
3NT	Denies a 4-card minor. Shows maximum strength with stoppers in both major suits.
4	Shows 4+ clubs and maximum strength.
4	Shows 4+ diamonds and maximum strength.

Responder's Rebids

Most of responder's rebids are natural. The exception is bidding a new major suit, which shows a singleton or void. For the sake of completeness, though, below are all of responder's rebids based on opener's rebid.

After Opener Rebids 2NT

Responder's Rebid	Meaning
Pass	Minimum strength, relatively balanced. Probably 5-4 in the minors. Responder should bid a minor with 5-5 distribution (or longer.)
3	Natural and non-forcing with 5+ clubs. Suggests 5 diamonds because opener is allowed to run to 3.
3	Natural and non-forcing with 5+ diamonds. Opener is expected to pass.
3	A singleton or void in hearts with slam interest. Forcing.
3	A singleton or void in spades with slam interest. Forcing.
3NT	To play.
4	Strong and forcing with 5+ clubs.
4	Strong and forcing with 5+ diamonds.

After Opener Rebids 3

Responder's Rebid	Meaning
Pass	Minimum strength.
3	Strong and forcing with 5+ diamonds.
3	A singleton or void in hearts with slam interest. Forcing.
3	A singleton or void in spades with slam interest. Forcing.
3NT	Natural and non-forcing. Responder may be something like 2-2-5-4 shape and willing to stop in no-trumps.
4	Natural and invitational to 5. Shows unbalanced shape because it bypasses 3NT.
4	Open for partnership discussion. Could be a cuebid with interest in a diamond slam, OR natural and forcing with 5+ diamonds.

After Opener Rebids 3

Responder's Rebid	Meaning
Pass	Minimum strength.
3	A singleton or void in hearts with slam interest. Forcing.
3	A singleton or void in spades with slam interest. Forcing.
3NT	Natural and non-forcing. Responder may be something like 2-2-4-5 shape and willing to stop in no-trumps.
4	Open for partnership discussion. Could be a cuebid with interest in a club slam, OR natural and forcing with 5+ diamonds.
4	Natural and invitational to 5. Shows unbalanced shape because it bypasses 3NT.

After Opener Rebids 3

Responder's Rebid	Meaning
3	A singleton or void in spades with slam interest. Forcing.
3NT	To play.
4	Natural and forcing with 5+ clubs.
4	Natural and forcing with 5+ diamonds.
4	Natural and non-forcing with 3 hearts and unbalanced shape. Proposes playing in the 4-3 major suit fit.

After Opener Rebids 3

Responder's Rebid	Meaning
3NT	To play.
4	Natural and forcing with 5+ clubs.
4	Natural and forcing with 5+ diamonds.
3	A singleton or void in hearts with slam interest. Forcing.
4	Natural and non-forcing with 3 spades and unbalanced shape. Proposes playing in the 4-3 major suit fit.

Examples

The following examples assume a 15-17 1NT opening bid. You can of course tailor Minor Suit Stayman to fit your own 1NT range.

		Opener			Responder
		KT93			5
		AK74			63
		J83			AT542
		A5			KJ832
		Opener 1NT 2NT (2)			Responder 2 (1) Pass

1. Minor Suit Stayman
2. Denies a 4-card minor and suggests minimum strength.

		Opener			Responder
		J95			AK3
		A92			K3
		AQ8			KJ52
		A932			QJT4
		Opener 1NT 3 (2) 5 (4)			Responder 2 (1) 4NT (3) 6

1. Minor Suit Stayman
2. Showing 4+ clubs
3. 1430 Roman Key Card Blackwood
4. 3 key cards
5. Signoff. It's worth pointing out that clubs as trumps will yield an extra ruffing trick compared to 6NT.

		Opener			Responder
		AKQ			8
		J54			AT3
		KQ5			A7632
		J983			A752
		Opener 1NT 3 (2)			Responder 2 (1) 3NT(3)

1. Minor Suit Stayman
2. Showing a spade stopper and asking responder for a heart control. Note the decision to bypass 3 with 4-3-3-3 shape and a bad suit.
3. Natural, promising a heart stopper.