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j*******e 发帖数: 2168 | 2 打6NT已经失一墩了,还rectify啥? :-) |
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l****a 发帖数: 272 | 3 这幅牌还是很有意思的。
对桌上的牌手, 我毒舌几句,因为我是旁观者清。
4个人的表演, 其实都有提高的空间。
1,E, 前面讲了, SK 得墩后攻C杀招.
2, S, 后面如何选择残局先不说, 但是应该熟悉或者清楚对方的首攻约定,
H9 不该认为是 Q109 攻出来的。上HJ 是很自然, 但是, 不够出彩。
3, W, 首攻, 这样的牌, 首攻确实很头疼, 不攻S 也不是没理由。
另外,"首攻无失误“,不能因为首攻了 H9 就责怪W,
但是, 首攻S 的话, 也许庄家更难打。
4, N, 我想多说几句。
看N的牌,有极好的控制, 软点和中间张相对又比较少, 其实, 这牌更适合打有将定
约. 他们的体系咱不熟悉, 但是, 应该有寻求低花配合的装置的。 即使没有, 那么
, 3nt 后跳6D 是什么呢? 3NT 我猜是否认了低花四张套了。那么不去找44 的6C 了
, 可以试试6D 嘛。 6D 应该不是6张, 6张的话, 强牌总可以在1NT 后转移起步或者
用其他逼叫手段的。 所以, 3nt-6d 可以认为是5张套, 寻求3张支持。 总比直接跳
进去6NT 细腻一些。 当然, 我不熟悉他们... 阅读全帖 |
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l****a 发帖数: 272 | 4 my 2 cents.
3NT 后的4D, 质量需要再好一些, 比直接顺路跳6D更强
至少直接跳6D 或者 6NT 都是否认了大满贯的.
4D 定将吗, 不好讲, 因为1NT 开叫人也许只有双张Dxx.
但是如果应叫人是6+ 的半坚固 D 套, 那么这个3S 就不是很合适了.
跳3S 暗示的是双套或者双套半, 还是要寻求一些支持才能定将的. |
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j*******e 发帖数: 2168 | 5 打6NT已经失一墩了,还rectify啥? :-) |
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l****a 发帖数: 272 | 6 这幅牌还是很有意思的。
对桌上的牌手, 我毒舌几句,因为我是旁观者清。
4个人的表演, 其实都有提高的空间。
1,E, 前面讲了, SK 得墩后攻C杀招.
2, S, 后面如何选择残局先不说, 但是应该熟悉或者清楚对方的首攻约定,
H9 不该认为是 Q109 攻出来的。上HJ 是很自然, 但是, 不够出彩。
3, W, 首攻, 这样的牌, 首攻确实很头疼, 不攻S 也不是没理由。
另外,"首攻无失误“,不能因为首攻了 H9 就责怪W,
但是, 首攻S 的话, 也许庄家更难打。
4, N, 我想多说几句。
看N的牌,有极好的控制, 软点和中间张相对又比较少, 其实, 这牌更适合打有将定
约. 他们的体系咱不熟悉, 但是, 应该有寻求低花配合的装置的。 即使没有, 那么
, 3nt 后跳6D 是什么呢? 3NT 我猜是否认了低花四张套了。那么不去找44 的6C 了
, 可以试试6D 嘛。 6D 应该不是6张, 6张的话, 强牌总可以在1NT 后转移起步或者
用其他逼叫手段的。 所以, 3nt-6d 可以认为是5张套, 寻求3张支持。 总比直接跳
进去6NT 细腻一些。 当然, 我不熟悉他们... 阅读全帖 |
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l****a 发帖数: 272 | 7 my 2 cents.
3NT 后的4D, 质量需要再好一些, 比直接顺路跳6D更强
至少直接跳6D 或者 6NT 都是否认了大满贯的.
4D 定将吗, 不好讲, 因为1NT 开叫人也许只有双张Dxx.
但是如果应叫人是6+ 的半坚固 D 套, 那么这个3S 就不是很合适了.
跳3S 暗示的是双套或者双套半, 还是要寻求一些支持才能定将的. |
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i****e 发帖数: 642 | 8 That is right.
I think cashing 4 kings plus CQ won't lose chance for other layout. Given
west holds 7 spades, it seems we can make 6NT 100%. |
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b***y 发帖数: 2804 | 9 这次出一道双明手的题目,娱乐一下。答对的或是积极参与的都有包子。
定约为6NT,西家首攻S10。你怎样去完成?
--
AK87654
AKQ3
AK
T9876 542
QJT9 --
-- J987654
J742 T93
AKQJ3
32
T2
Q865 |
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i****e 发帖数: 642 | 10 Can you change the S7 into S8? Then I have 100% line :)
Without that, I play DAKQ and CAK. What is the opp's holding in minors? |
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p***r 发帖数: 20570 | 11 Suppose C 4-1 off side, D is 4-1 or better.
you just cash DAKQ. CA, DJ (pitch C2). Now you play S 5, if east plays S8 (
if east plays low S, you just play S7 to end play west), you play SA and
play C to CQ (now you discovered the bad news in C). Now you play S to S7 or
cover east's S9/10 with SJ.
If D is 5-0. You have to assume some suits break well to make it. |
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b***y 发帖数: 2804 | 13 Now you know that I give you S7 (not S8) for a reason... |
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o*******n 发帖数: 6500 | 14 方块既然不是5-0,就好办了
兑现方块AKQ,草花到明手,兑现方块J,手上垫小草花
引黑心,东家如果出小,就7飞过,如果西能回出草花,就有2S, 1H, 5D, 4C
否则西就要送一副红心或者黑心
如果东家出8以上,就A吃住,再草花到明手,如果草花不是4-1,已经有12墩了
如果西家单张草花,就再打黑心,用J或者7盖过东家的牌投入西家 |
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b***y 发帖数: 2804 | 15 嗯,这个是正解。
我相信在实战中很多人都会打错。最常见的错误是打黑桃之前先拔两轮梅花。等发现梅
花不通的时候,再想投入西家已经来不及了,因为明手过早用掉了一个进张。 |
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v**********e 发帖数: 1295 | 16 Actually, it doesn't depends on the level of player. There should be
unambiguous answer for both sequences in SAYC and standard 2/1.
(1) slight slam interest with 6 card H.
(2) BALANCE invitation with 5 card H.
If with unregular partner on BBO:
(1) Assume slight=no, so to play;
(2) Because usually we need an artificial bidding to show a forcing game
hand with 5+ card H, partner may try to show such kind of hand with this
sequence. Mostly, I will bid 6NT. |
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b***y 发帖数: 2804 | 17 再具体一些:我叫2D转换,如果同伴只能叫2H,接下去我就叫5NT(pick-a-slam),让
同伴在6H和6NT中选。 |
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i****e 发帖数: 642 | 18 So the reason for not bidding 3C is likely due to weak suit. Anyway 3NT is
an easy make. If you like to create swing, the better chance seems to be 6NT
. For example, if pd holds
Qx
Axx
Kxx
T9xxx
It works when either S or C suit splits friendly. |
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b***y 发帖数: 2804 | 19 This hand requires C splits friendly. In that case 6C will make too. Spades
are irrelevant: if you can take 4 clubs, you don't need spades split; if you
have to lose 2 clubs, then spades 3-3 doesn't help.
But on some other hands you may need to establish spade tricks. For example:
xx Qxx Kxx Kxxxx, 6NT has almost no chance, while 6C may roll home even if
spade splits 4-2. |
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i****e 发帖数: 642 | 20 My guess was based on the assumption that pd does have 5 clubs. Then it is
likely weak, which he thinks it is not worthy to introduce. If this is true,
the chance he holds SQ increases. In the hand I gave, if LHO holds stiff CQ
or CK, where declarer may have only two club tricks, 6NT still has chance
relying on spades.
Spades
you
example:
if |
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p***r 发帖数: 20570 | 21 With SQx, partner might bid 3S to show that specific hand type. Qx AQx Jxx
T9xxx, it looks like a 3S bid to me (or 3H).
4C is probably more like xx Axx KJx xxxxx
6C is a contract that always has some chances to make and the chances are
usually bad.I guess the average chance to make 6C is about 20% facing a bad
C suit, which is likely the case. Even facing CKxxxx, the chance can still
be under 40%.
6NT can be wrong sided even if partner holds SQ, like SQx HAQx Dxxx CT9xxx.
So, it's probably wiser... 阅读全帖 |
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b***y 发帖数: 2804 | 22 从这个星期开始,争取恢复每周一题。
IMP,有对无,你持
KQJT,T74,J,JT954
同伴发牌并开叫2C,你应叫2S(按理需要有第5张黑桃,但你觉得自己四张套的结构还
不错)。接下去的叫牌比较庸俗(对方没有插叫):2C-2S-3S-4S-6S
左手首攻H2,你们两手牌如下:
A52
KQ
AK742
AKQ
KQJT
T74
J
JT954
看来2S有些自作聪明,貌似6C更好,而最佳定约是6NT,任何分布铁打不宕。但现在还
不是检讨的时候。东家HA吃住,回一张红心到明手,你接下去计划怎么打? |
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b***y 发帖数: 2804 | 23 从这个星期开始,争取恢复每周一题。
IMP,有对无,你持
KQJT,T74,J,JT954
同伴发牌并开叫2C,你应叫2S(按理需要有第5张黑桃,但你觉得自己四张套的结构还
不错)。接下去的叫牌比较庸俗(对方没有插叫):2C-2S-3S-4S-6S
左手首攻H2,你们两手牌如下:
A52
KQ
AK742
AKQ
KQJT
T74
J
JT954
看来2S有些自作聪明,貌似6C更好,而最佳定约是6NT,任何分布铁打不宕。但现在还
不是检讨的时候。东家HA吃住,回一张红心到明手,你接下去计划怎么打? |
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b***y 发帖数: 2804 | 25 其实也不是很难。如果是2C-2D起步,一旦开叫方显示25-27大牌点,应叫方就可以凭点
力叫上去。实战中6NT是一个很popular的定约。 |
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i****e 发帖数: 642 | 26 应该是最容易叫到的定约。实战是由于“自作聪明” 偏离了正常的6NT。
在有些情况下,6C可能是最佳定约。现代的叫牌体系的设计不倾向于低花的局和贯。经
常的情况是,由于约定叫的缘故,梅花连配合都很难显示,别说满贯了。 |
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b***y 发帖数: 2804 | 27 MP双有,你拿到一手不错的牌:A64,J,A872,AKQT3
你开叫1C,同伴应叫1H,你再叫2D。科普一下,开叫方的二阶再叫花色水平高于一阶开
叫花色,这种序列称为“逆叫”。同伴应叫方如果示选第一门花色的话,定约必须要抬
高到三水平,所以这样的叫牌显示了额外实力。一般来说对逆叫的要求是,第一门花色
(即一阶开叫花色)长于第二门,第二门一般需要至少四张(偶有例外),总的点力大
概在16点以上。这一手牌,五张梅花四张方块,18个大牌点,长度和实力都符合要求。
注意逆叫都是至少逼叫一轮(但如果应叫方示弱的话可以不逼局)。
之所以要科普,是因为我发现这是众多牌手不太了解的部分。也许对于这个版面的爱好
者来说这个太初级了,但如果去BBO等网站看看,你会发现八成以上牌手不懂逆叫的原
理,拿着12-13点4-5甚至4-4牌型去作逆叫的比比皆是,所以写了上面一段以正视听。
闲话少叙,同伴再叫2S作为进局逼叫,你跳叫3NT显示黑桃有止。这些未必是逆叫之后
最佳的手段,但同伴不喜欢复杂的序列,你们也没有花时间去讨论那些。起码
这样的叫牌简单直接了当。接下去同伴更简单地跳叫6C。由于是双人赛,你短暂地考... 阅读全帖 |
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b***y 发帖数: 2804 | 28 IMP双有,你做庄3NT:
JT4
AJ9
KQ7542
7
AK
QT3
JT
AK6432
叫牌很简单: 1C-1D-2NT-3NT (对方没有插叫)
6D乃至6NT貌似不是一个很差的定约,不过你现在要集中精力做成3NT。西家首攻S5(长
四),东出小,你暗手吃进。准备如何继续? |
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b***y 发帖数: 2804 | 29 并不是一个很好的满贯。没有很好的配合,联手31点就比较吃力。先打方块试试吧,这
上面拿到5墩的可能最大。 |
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i****e 发帖数: 642 | 30 The same as my choice. D9 holds the trick, and both opps follow small. What
is next? |
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b***y 发帖数: 2804 | 31 Very unlikely that RHO is ducking DQ. But even with 5 diamond tricks, I only
have 11 top tricks. As I said, this is not a great slam, although hardly
the worst I've seen.
I think S9 makes spade suit more attractive for developing the additional
trick. Options are:
1) Finesse SJ, if lost then later finesse S9. 75% chance.
2) Finesse SJ, if lost then later play AK for drop. In addition to LHO
holding SQ, it also works if S are 3-3, or ten-doubleton. Somewhere around
77%.
3) Cash AK, then 3rd spade... 阅读全帖 |
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i****e 发帖数: 642 | 32 Nice analysis. I think your plan is better than what I did, although I made
it due to stupid defense mistake :)
I continued D, with east discarding a H. So there were only 4 D tricks. I
cashed one more D, discarding H in hand, while east discarded another H.
Then I went to similar approach as your plan 3, trying to drop any of ST or
SQ, or 3-3, but found east holding QT fifth (he did not pitch any on D!).
Now it seemed to me the only chance was C3-3 and Q onside. But west won CQ,
but returned C ... 阅读全帖 |
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i****e 发帖数: 642 | 33 Yes, that was what happened :) I did not expect to make it if CQ is off.
East unguarded hearts before I tested spades (keeping both useless spades
and clubs). But that could mislead declarer.
West's mistake in the end can only be described as stupid.
un- |
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n****i 发帖数: 109 | 34 BBO, 都是Expert level, EW pass all the time:
N S
1H 1S
2C 2D(FSF)
2NT 3S
3NT 6NT
How to lead from East:
S=J72
H=A95
D=9753
C=K104 |
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b***y 发帖数: 2804 | 35 6NT down 2. Want to try again? |
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x*****e 发帖数: 309 | 37 建议1.看看酶活性单位的定义,One unit is defined as the amount of enzyme
required to digest 1 µg of λ DNA in 1 hour at 37°C in a total
reaction volume of 50 µl. 切超螺旋质粒提高到5-10倍。确定你加的酶足够,
但不要超过总体积的1/10; 2.看看两个酶切位点之间距离是否大于6nt,小于还是选其
他酶吧。3.如果不能同时切,可以先用低盐buffer,切好后再补NaCl变成高盐buffer,加
第二个酶。 Good luck! 其实如果是刚要来的质粒,怎么切都不行的话,还是测序吧。 |
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z********4 发帖数: 701 | 38 还真是,有些RNA病毒基因组非得是6nt的倍数,学习了,多谢 |
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