【每周一题】实战梅花满贯

b
bucky
楼主 (未名空间)
前一阵太忙,版面疏于管理,这周多出一题。

Sectional Swiss实战,无对有,你做庄6C:

A5
KJ74
AQ93
AK7


Q95
642
QJT9653

叫牌比较粗糙:南家开叫3C,对方PASS之后北家直接跳进6C。牌摊下之后看,还算是个不错的定约。左手首攻SQ,你准备怎样去打?
vikingpirate
2 楼
Ruff in hand. Then small D to K.
(i) If it wins, two round of C and small D to J.
(ii) If it fails, try H 33. D finesse could be the last chance.
i
imlate
3 楼
SA, pitch a D.
CA (both follow?).
Ruff S to hand.
H to K, and plan trump back to play second H.

【 在 bucky (bucky) 的大作中提到: 】
前一阵太忙,版面疏于管理,这周多出一题。
Sectional Swiss实战,无对有,你做庄6C:
A5
KJ74
AQ93
AK7

Q95
642
QJT9653
...................
b
bucky
4 楼
You meant small H to K, then small H to J?
In case (i), small H to K wins, then small H to J wins, now what?

【 在 vikingpirate (pp++2.9) 的大作中提到: 】
Ruff in hand. Then small D to K.
(i) If it wins, two round of C and small D to J.
(ii) If it fails, try H 33. D finesse could be the last chance.
b
bucky
5 楼
Second H wins as well, now what?

【 在 imlate (toolate) 的大作中提到: 】
SA, pitch a D.
CA (both follow?).
Ruff S to hand.
H to K, and plan trump back to play second H.
i
imlate
6 楼
Clear trump if needed, and try H3-3. If not, LHO will eliminate H threat
card. Then play DK onside.

【 在 bucky (bucky) 的大作中提到: 】
Second H wins as well, now what?
vikingpirate
7 楼
Yes, should be H.

Then throw HQ on SA, done.

【 在 bucky (bucky) 的大作中提到: 】
You meant small H to K, then small H to J?
In case (i), small H to K wins, then small H to J wins, now what?
j
josephine
8 楼
I like your play, but I don't think you can say 'done' yet.
What if RHO is the one who has 4H? He can exit with H when you play a D to
him, and you can still lose 2D if unlucky?

【 在 vikingpirate (pp++2.9) 的大作中提到: 】
Yes, should be H.
Then throw HQ on SA, done.
b
bucky
9 楼
Why would RHO duck HA? Technically possible but in practice not, even for
world class.

【 在 josephine (jo) 的大作中提到: 】
I like your play, but I don't think you can say 'done' yet.
What if RHO is the one who has 4H? He can exit with H when you play a D to
him, and you can still lose 2D if unlucky?
i
imlate
10 楼
That is the benefit to keep SA!

【 在 vikingpirate (pp++2.9) 的大作中提到: 】
Yes, should be H.
Then throw HQ on SA, done.
b
bucky
11 楼
是的。这副牌有三个学习点,居然在实战中出现。

第一个是关于红心的打法。这种Qxx对着KJxx的结构,要争取拿三墩,标准打法就是对
着KJxx出两次,可以兼顾左手Ax的情况。对于这副牌来说,这样打还有一个重要理由,就是对方没法迫使你做过早的选择。比方说你出红心到K,然后红心拉回到Q,除了损失左手Ax的机会之外,左手现在第二轮HA赢了以后马上出方块,可以迫使你在不知道红心是否3-3的情况下要马上决定是否飞方块。一个好的做庄路线,是要尽量去尝试所有的
可能性,而不是被先期剥夺选择。

与上面所说相关的,第一墩不要出SA,是一种观望战略,也是保留选择的重要法宝。类似的牌例很多,但这副牌里的作用比较subtle,是为了产生一个可能的对右手方的剥光投入。

说到剥光投入,就要看一下方块结构。AQT或是AQ9,是最适合投入的结构。两轮红心之后,如果左手不上A,你就用SA垫去HQ,将吃一张红心。如果红心3-3, 自然不用飞方
块。如果左手红心原先为Axxx,则右手方已经没有红心,你打方块,如果左手出小你就放D9,左手出10或J你就放Q,右手吃进之后就被投入了,只能给你一吃一垫或是让你做好一张方块。

所以这个打法,基本上可以在左手有HA的情况下确保定约完成。在右手有HA的时候,仍然可以先试红心,不成的话再飞方块。

【 在 imlate (toolate) 的大作中提到: 】
That is the benefit to keep SA!
vikingpirate
12 楼
It is a very interesting hand. It is more likely a BridgeMaster problem
rather than real hands. A perfect hand for ACBL bulletin dealer problem.

It includes some elements of "Morton's fork", avoidance, and a throw-in
endplay. Not easy to figure out all the possibilities at the table.

【 在 bucky (bucky) 的大作中提到: 】
是的。这副牌有三个学习点,居然在实战中出现。
第一个是关于红心的打法。这种Qxx对着KJxx的结构,要争取拿三墩,标准打法就是对
着KJxx出两次,可以兼顾左手Ax的情况。对于这副牌来说,这样打还有一个重要理由,
就是对方没法迫使你做过早的选择。比方说你出红心到K,然后红心拉回到Q,除了损失
左手Ax的机会之外,左手现在第二轮HA赢了以后马上出方块,可以迫使你在不知道红心
是否3-3的情况下要马上决定是否飞方块。一个好的做庄路线,是要尽量去尝试所有的
可能性,而不是被先期剥夺选择。
与上面所说相关的,第一墩不要出SA,是一种观望战略,也是保留选择的重要法宝。类
似的牌例很多,但这副牌里的作用比较subtle,是为了产生一个可能的对右手方的剥光
投入。
...................
j
josephine
13 楼
Not keeping SA also has some benefit, I think.
Suppose RHO has HATxx and D control, he will be thrown in immediately at
first round of H.
In this case, keeping SA and trying H3-3 will go down I believe.

【 在 imlate (toolate) 的大作中提到: 】
That is the benefit to keep SA!
b
bucky
14 楼
Yes. And also need to manage entry properly. For example if you ruff spade
at trick 1, you cannot draw trumps immediately, you have to play a heart
toward dummy, if it wins then you draw 2 trumps ending in hand then another heart. That risks heart 5-1 and someone gets a ruff, but the risk is worth
taking. Also, if trumps are 3-0, you probably need to draw all of them
before playing the second heart, LHO can hop HA and force you to guess by
playing a diamond, but c'est la vie.

【 在 vikingpirate (pp++2.9) 的大作中提到: 】
It is a very interesting hand. It is more likely a BridgeMaster problem
rather than real hands. A perfect hand for ACBL bulletin dealer problem.
It includes some elements of "Morton's fork", avoidance, and a throw-in
endplay. Not easy to figure out all the possibilities at the table.
i
imlate
15 楼
In that case, it is always down if RHO ducks the first heart (we are not
going to finesse with H9). Also, he may have the second trump to exit.

【 在 josephine (jo) 的大作中提到: 】
Not keeping SA also has some benefit, I think.
Suppose RHO has HATxx and D control, he will be thrown in immediately at
first round of H.
In this case, keeping SA and trying H3-3 will go down I believe.
j
josephine
16 楼
you play two rounds of trump if not keeping SA.
and I learned that RHO won't duck HA in practice:)

【 在 imlate (toolate) 的大作中提到: 】
In that case, it is always down if RHO ducks the first heart (we are not
going to finesse with H9). Also, he may have the second trump to exit.
b
bucky
17 楼
Why is RHO thrown immediately? Say RHO returns a heart, do you finesse with 9 or play Q?

【 在 josephine (jo) 的大作中提到: 】
Not keeping SA also has some benefit, I think.
Suppose RHO has HATxx and D control, he will be thrown in immediately at
first round of H.
In this case, keeping SA and trying H3-3 will go down I believe.
j
josephine
18 楼
Why would you play Q?

【 在 bucky (bucky) 的大作中提到: 】
Why is RHO thrown immediately? Say RHO returns a heart, do you finesse
with
9 or play Q?
b
bucky
19 楼
To catch RHO Tx case, playing H9 will lose in this case.

【 在 josephine (jo) 的大作中提到: 】
Why would you play Q?
j
josephine
20 楼
OK, one needs to guess.
If RHO has ATxx or A8xx, though, not keeping SA still has better chance?

【 在 bucky (bucky) 的大作中提到: 】
To catch RHO Tx case, playing H9 will lose in this case.
i
imlate
21 楼
We want to cater the case of LHO with HAx, so we need use second round of
trump as entry to hand.

【 在 josephine (jo) 的大作中提到: 】
you play two rounds of trump if not keeping SA.
and I learned that RHO won't duck HA in practice:)
j
josephine
22 楼
If you think LHO has HA, just choose the keeping SA route;
if you think RHO has HA, not keeping SA might be better?

【 在 imlate (toolate) 的大作中提到: 】
We want to cater the case of LHO with HAx, so we need use second round of : trump as entry to hand.
b
bucky
23 楼
If you keep SA
1) you make the contract whenever LHO has HA
2) when RHO has HA, you make the contract when H are 3-3 or RHO has A8xx or A10

The only time when playing SA at trick 1 gain, is when RHO has ATxx, AND you decide to play H9 on second heart. Note that you will lose when RHO has
A8xx. You cannot cater for either ATxx or A8xx.

【 在 josephine (jo) 的大作中提到: 】
OK, one needs to guess.
If RHO has ATxx or A8xx, though, not keeping SA still has better chance?