My last article used Short Suit Total (SST) analysis to examine splinter auctions. The Short Suit Total is the number of cards held in the partnership's two shortest suits. You can estimate the working high card points required to make a slam using the SST and this simple formula:
Working HCP needed for slam: 20 + 3 * (SST-1)
For example, if the SST is 4, then the partnership will require: 20 + 3 * (4 - 1) = around 29 working HCP to make a slam. (If math is not your strong suit, review my last article to learn more.)
If your partner's bid describes his HCP within a 3-HCP range and describes his shape (as a splinter does), it becomes easy to:
This method provides an easy way to see if the partnership is in the slam zone in many auctions. This article is the first of three to apply SST analysis to Jacoby 2NT auctions (J2N). It will examine tuning the bidding after J2N to make finding the slam zone easier. J2N is a different animal than a splinter and the bidding approach after J2N is quite different. Before we delve into J2N, let's contrast J2N with splinter raises to see why.
J2N versus Splinter
A splinter raise communicates all the information opener needs to judge when the partnership is in the slam zone: responder's specific shape and his high card range. From this info opener can identify:
Finding the slam zone is a piece of cake when you know that the partnership needs 26 working HCP to make a slam and in fact holds 25-27 working HCP. This is the beauty and brilliance of the splinter raise--all the information needed to spot the slam zone is packed in one bid. Now let's consider the problem of locating the slam zone in a J2N auction:
In short, after a J2N raise, opener has no clue whether the partnership is in the slam zone. The J2N raise simply does not carry the same amount of information that a splinter bid does.
So how to continue the auction? Before we can consider a slam, one of the partners will need to describe his shape and values more precisely. But who? When faced with an uninformative J2N raise, opener should describe his own hand rather than try to take over. Opener should communicate enough information that responder can accurately judge the SST and working HCP for the partnership (and hence whether the partnership is or is not in the slam zone).
Andrew's first guideline: After a J2N raise, unless opener is very strong and can take over, opener describes his hand and responder makes the decisions.
Responding to J2N
Let's take a look at the traditional J2N responses in the context of slam analysis. As I'll show, they make it difficult for responder to perform an SST analysis at the table. I'll propose some minor improvements that will help tremendously. However, let's start with this familiar structure
1M -- 2NT -- ?
3 new suit = shortness in this suit, 11+ HCP
3M = No shortness, 16+ HCP
3NT = No shortness, 14-15 HCP
4 new suit = A good 5-card suit, 11+ HCP (e.g, ♠AQJxx, ♥x, ♦KQJxx, ♣xx)
4M = No shortness, 11-13 HCP
Evaluating the Traditional J2N Responses
Recall that after J2N opener's bidding goal is to describe his shape and values well enough that responder can estimate the SST and working HCP for the partnership. Do these responses to J2N provide enough information? Unfortunately they do not. Responder will have two significant problems if your methods end with the above responses:
Determining SST
Let's look at the SST in some typical J2N auctions.
♠-♥-♦-♣
4-4-3-2 (Responder)
5-2-3-3 (Opener)
Opener has a dull 5-2-3-3 shape, responder holds a 4-4-3-2 pattern, typical for J2N. The SST for the partnership is 4, 2 for responder's club doubleton and 2 for opener's heart doubleton. With an SST of 4, around 29 working HCP are required for a slam.
♠-♥-♦-♣
4-4-3-2 (Responder)
5-3-3-2 (Opener)
This time opener's doubleton is in clubs facing responder's doubleton. With opener's doubleton wasted, the SST is 5: 2 for the ♣ doubleton and 3 for the ♦ tripleton. With an SST of 5, slam needs approximately 32 combined HCP. Straight away we see a problem with the traditional responding scheme. Since responder knows only that opener is balanced or semi-balanced and does not know the location of opener's doubleton, he can not diagnose this unfortunate duplication of shortness.
♠-♥-♦-♣
4-4-3-2 (Responder)
6-2-2-3 (Opener)
What happens to SST when opener holds a semi-balanced pattern? With doubletons in two suits, (three actually) the SST is 4, which suggests slam should need around 29 working HCP. But if that is so, how can we explain this hand:
Only 24 working HCP, yet slam is excellent. Two factors have driven down the HCP requirements from 29 to 24:
Lets see what happens if we change a small ♠ into a small ♦.
This time, we need a 2-2 trump break (40%) to even make 5. Moving one small card from spades to diamonds has reduced the combined trick-taking power by about 1.5 tricks! When opener is 5-2-3-3 the SST is 4. To compensate, we need an extra king. With only a 9-card trump fit, we need the queen of trumps in addition to solidify the trump suit. In other words, we need an additional 5 working HCP (bringing the total from 24 back to 29 HCP) to make slam with the less powerful 5-2-3-3 shape.
Clearly, the 6-2-2-3 shape was much more powerful than 5-2-3-3 and using the same calls (3M, 3NT, 4M) to show semi-balanced and balanced hands makes it impossible for responder to tell the SST accurately in many auctions. Without knowing the SST, it will be easy to miss a light slam based on three working doubletons. We may also overbid to a bad slam when the SST is 5 because the partnership holds wasted shortness.
An Improvement to J2N Responses
Our brief exploration of balanced hands has shown how SST ranges from 3 (with three working doubletons) to 5 with one working doubleton. Let's make one small change to our J2N structure to help us sort out opener's exact pattern:
1M -- 2NT -- ?
3M = 2 + doubletons and 14+ HCP
3M now shows specifically the semi-balanced patterns: 5-4-2-2, 6-3-2-2, and 7-2-2-2.
We will also need to tweak our responding structure a bit to ferret out the location of the doubletons in opener's hand. Over opener's 3M, the cheapest call will ask for opener's side suit (or fragment). Opener can name a second suit or return to our suit with 7-2-2-2 shape. Responder will then know the location of all doubletons and hence the short suit total exactly.
3NT = one doubleton and 17-19 HCP
3NT shows specifically 5-3-3-2 patterns. Since 11-14 balanced hands rebid 4M and 15-17 balanced hands open 1NT rather than 1M, 3NT can be restricted to the 17-19 HCP range. Over 3NT, responder can bid 4♣ to ask for the doubleton if he needs to know the exact SST.
Conclusion
You may have noticed an odd absence in my description of these auctions--no cuebids! Never fear, cuebids have their place and my next article will discuss when cuebids are and are not appropriate after a J2N auction.
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