v**********e
发帖数: 1295 | 1 关于持什么样的牌适合用Jacoby 2NT来答叫，四张支持是必须的，牌型呢？
按照设计者的最初想法，我理解大概是用来解决强均型应叫牌的，通过对开叫人牌型点
力的询问，来探索满贯。由于开叫人的牌型对叫牌前景至关重要，因此放弃应叫人自身
的描述而用类似接力的方式澄清开叫人的信息，这也符合平均型原理的基本思想。
不过不少专家也支持持非均牌的J2NT应叫，比如本月Bulletin上一副牌：
AK743
QJ82
-
AT63
面对同伴1H开叫，近半数专家选择用J2NT应叫。但这种处理方法还未必能称作主流，本
题的投票结果相当分散，2S/1S/4D也都有支持者。
这手牌对于4D或许显得太强了，空间也浪费掉了；1S没有建立逼局也没表示出支持，效
率也比较低，空间倒是省了，但被干扰的可能性增大；对于2S，这手牌有点弱套也不太
好。这样似乎2NT是最好的选择了。
但对于如下这手牌面对1H开叫，有可用的低花做2/1，你是否还会选择J2NT呢？
S AK95
H KQ84
D AJT72
C - | p***r
发帖数: 20570 | 2 It is usually a matter of how good your system after 1/1 and 2/1 is. If you
can show both strength and shape information after 1/1 and 2/1 well, then
jacoby 2nt shouldn't be used for most hands when trump suit isn't your
longest suit. Still, for most players, their 2/1 and 1/1 can't allow them to
exchange shape and strength information conveniently. Therefore J2nt can
largely simplify the bidding and is prefered. In my system, j2nt is only bid
when the trump is the longest suit, so that would usually set up the trump
and make the subsequent bidding easy.
So for hands like AKxx KQxx Axx xx, I usually suggest 1S response after 1H,
because that's the easiest way to allow you land at 4-4 fit of 6S or 7S
when partner also holds 4 good spades, like QJxx Axxxx Kx Ax for 7S.
For KQJxx xx xx AKxx, after 1S, it is a clear 2N bid, because contract in S
should almost always be better than clubs, unless partner holds Axxxxx x Ax
QJxx, which is very rare. Even hands like Axxxx x Ax QJxxx is also very
likely here.
So if you have a good possibility to play in another suit, you should tend
not to bid J2nt. If the opening major is the mostly likely place to play,
you can usually bid J2nt. Of course, if your 2/1 or 1/1 is very primitive,
J2nt should also be used to simplify the bidding.
【在 v**********e 的大作中提到】
: 关于持什么样的牌适合用Jacoby 2NT来答叫，四张支持是必须的，牌型呢？
: 按照设计者的最初想法，我理解大概是用来解决强均型应叫牌的，通过对开叫人牌型点
: 力的询问，来探索满贯。由于开叫人的牌型对叫牌前景至关重要，因此放弃应叫人自身
: 的描述而用类似接力的方式澄清开叫人的信息，这也符合平均型原理的基本思想。
: 不过不少专家也支持持非均牌的J2NT应叫，比如本月Bulletin上一副牌：
: AK743
: QJ82
: -
: AT63
: 面对同伴1H开叫，近半数专家选择用J2NT应叫。但这种处理方法还未必能称作主流，本
| p*********6
发帖数: 679 | 3 If you bid 1S here, what would be your followup bid when the bidding goes 1H
-1S-1NT? It seems you would need a way to show gf (such as 2D checkback),
otherwise partner would not believe you have a gf hand with good H support -
a high price to pay for a could-be/unlikely 4-4 s fit game search. As you
said, j2nt definitely simplifies the bidding. You show gf and support (so-
called support with support) in one bid.
,
【在 p***r 的大作中提到】
: It is usually a matter of how good your system after 1/1 and 2/1 is. If you
: can show both strength and shape information after 1/1 and 2/1 well, then
: jacoby 2nt shouldn't be used for most hands when trump suit isn't your
: longest suit. Still, for most players, their 2/1 and 1/1 can't allow them to
: exchange shape and strength information conveniently. Therefore J2nt can
: largely simplify the bidding and is prefered. In my system, j2nt is only bid
: when the trump is the longest suit, so that would usually set up the trump
: and make the subsequent bidding easy.
: So for hands like AKxx KQxx Axx xx, I usually suggest 1S response after 1H,
: because that's the easiest way to allow you land at 4-4 fit of 6S or 7S
| b***y
发帖数: 2804 | 4 这个牌选择用J2NT大概是数害相权取其轻。如果是黑桃梅花对换，肯定从2C起步了。其
实这手牌叫2S挺好啊，后续的叫牌可以轻易显示红心配合及短方块，整体特征应该可以
描述清楚了。
【在 v**********e 的大作中提到】
: 关于持什么样的牌适合用Jacoby 2NT来答叫，四张支持是必须的，牌型呢？
: 按照设计者的最初想法，我理解大概是用来解决强均型应叫牌的，通过对开叫人牌型点
: 力的询问，来探索满贯。由于开叫人的牌型对叫牌前景至关重要，因此放弃应叫人自身
: 的描述而用类似接力的方式澄清开叫人的信息，这也符合平均型原理的基本思想。
: 不过不少专家也支持持非均牌的J2NT应叫，比如本月Bulletin上一副牌：
: AK743
: QJ82
: -
: AT63
: 面对同伴1H开叫，近半数专家选择用J2NT应叫。但这种处理方法还未必能称作主流，本
| v**********e
发帖数: 1295 | 5 checkback之后表达出高花支持的探贯牌还是有坑的，不过一般也只能表达三张支持。
1H
-
【在 p*********6 的大作中提到】
: If you bid 1S here, what would be your followup bid when the bidding goes 1H
: -1S-1NT? It seems you would need a way to show gf (such as 2D checkback),
: otherwise partner would not believe you have a gf hand with good H support -
: a high price to pay for a could-be/unlikely 4-4 s fit game search. As you
: said, j2nt definitely simplifies the bidding. You show gf and support (so-
: called support with support) in one bid.
:
: ,
| p***r
发帖数: 20570 | 6 Well, if you play two way checkback, you have two ways to show a gf H
support,
1H 1S
1N 3H
and
1H 1S
2D 2x
3H
1H
-
【在 p*********6 的大作中提到】
: If you bid 1S here, what would be your followup bid when the bidding goes 1H
: -1S-1NT? It seems you would need a way to show gf (such as 2D checkback),
: otherwise partner would not believe you have a gf hand with good H support -
: a high price to pay for a could-be/unlikely 4-4 s fit game search. As you
: said, j2nt definitely simplifies the bidding. You show gf and support (so-
: called support with support) in one bid.
:
: ,
|
|
