TWERB Against strong 1C

	When the opponents open a strong 1♣(say Precision, 16+) then it is desirable to compete with shapely hands. TWERB (Two-Way Exclusion Relay Bids) is a convention that shows all single-suited and two-suited hands and may sometimes exploit the fundamental weakness of strong 1♣ systems – that playing Precision etc. the first two bids are totally artificial (stating points and not suits/distribution).
	As a defender, if you can find a fit quickly and pre-empt to the limit then that makes life difficult for the Precision side as they have no idea what suit(s) partner has nor if there is a fit.
	The scheme for TWERB is that any suit bid shows either the next suit up or the two suits above that. The two non-touching suits are shown by bidding NoTrumps and double shows a strong hand: -
	Over RHO 's 1♣ opening: -
	dbl = strong, at least as strong as opener's hand  1♦ = ♥'s OR ♠'s and ♣'s 1♥ = ♠'s OR ♣'s and ♦'s  1♠ = ♣'s OR ♦'s and ♥'s  2♣ = ♦'s OR ♥'s and ♠'s  1NT = ♣'s and ♥'s  OR ♦'s and ♠'s  The convention also applies after the bidding has started 1♣ pass 1♦ : -  Then, after the negative 1♦ response we have, by the next player: -  dbl = strong, at least as strong as opener's hand  1♥ = ♠'s OR ♣'s and ♦'s  1♠ = ♣'s OR ♦'s and ♥'s  2♣ = ♦'s OR ♥'s and ♠'s  1♥ = ♠'s OR ♣'s and ♦'s  1NT = ♣'s and ♥'s  OR ♦'s and ♠'s
	The convention can also be used over a 2♣ opening and 2♦ response .

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]。