Life, who'd been doing with it?

Hi all

As is so often the way, a trickle of ideas to improve Chilli has arrived just at the same time as real life has intruded with a large To Do list. So I'm going to have to restrict myself to little and often on the blogging front.

Shunts are so huge that Geoff, Peter and I are only slowly grasping the subtle inferences available to us with this rich new language. For instance, in the auction (2 weak) dbl (5) pass; (pass) dbl, what do you reckon the doubler has?

In the old days it could be anything from more defence than you could expect from the first double to some rock-crusher, maybe with both majors. Now, however, we know that with the latter type of hand, he would either have shunted to a long suit or made a cue shunt instead of the first double. So the doubler has something more like the former - probably about strong no-trump strength - and partner will probably pass unless he has a decent suit.

One area where shunts have dramatically improved possibilities is in sequences like 1 - 2, since now strong opener does not have to grind his teeth and curse partner for disturbing the auction. For that reason, we feel much more confident in using such bids. We've also extended their use to wide range and sub-minimum values opposite limited openings, along these lines:

• 1 - 2/2: 0-3 points, six cards


• 1 - 2/2: 0-7 points, six cards


• 1 - 2: 0-7 points, six cards

All these have a useful pre-emptive effect without doing us any harm. The second one is useful in that it distinguishes these hands from those that bid 2M the second time round with only five cards. The last one is possible because a minimum hand can go via 1 (but 1 - 2 needs to be kept up to minimum strength as there is no alternative route).

This is actually very similar to an idea suggested by Piet some time ago.

Best wishes
Alan

Strengthening the bridge

A Happy New Year to all Chillians and bridge players everywhere! You may still be suffering from the after effects of the festive season, but here at Chilli Towers we have been beavering away at the coalface of human knowledge (or something like that).

Last month I blogged about the new Chilli disturbed structure with the weak 2NT and shunts (Bridge over disturbed waters). Now we want to get some more work out of one of these wonder beasts, the cue shunt.

The first thing to say is a simple clarification: with a natural shunt, it's possible to stop short of game if partner completes the shunt, but with a cue shunt you can never want to stop after completion. So it's simplest if we treat the cue shunt as forcing to game in all variations.

Now to something more substantial. We would strongly prefer that a natural shunt to a previously unshown suit guarantees at least five cards, but if that is the case we will struggle to find four-four fits in an unshown major. Now traditional Lebensohl has a mechanism for this – either a direct cue bid or a cue rebid after 2NT shows four cards in the other major, the difference being that one route shows a guard, the other doesn't. This has a number of defects:

1. It restricts the use of the cue bid to hands with four in the other major and excludes many other hands with uncertain destination


2. It provides a memory task to remember which route shows the guard in this particular partnership


3. It compromises the 2NT bid by including a strong hand amongst weak ones


4. Intuitively the cue bid sounds like a no-trump try rather than a bid of the other major.

Given that we have highly expressive two-step transfers at our disposal, can we do better than that, and in a Chilli sort of way? Yes we can. Here's a revised response scheme to a cue shunt to a major:

1. under-break with four cards in the other major; otherwise


2. bid 3NT with a guard; otherwise


3. over-break in a suit to show a five-card suit; otherwise


4. complete to deny any of the above.

So the auction goes 1 (2) 3 – 3. Opener has responded to our cue shunt with an under-break showing four hearts. Isn't this very irritating if all along we wanted to play in 3NT?

This is a good bit. One of the characteristics of shunts is that they can be used only once, since by definition you are above 2NT after first use. This means that after partner under-breaks your cue shunt, you can cue bid again! So here we can continue with the repeat cue bid 3, which systemically asks for a stop for 3NT.

(After a cue shunt to a minor, the repeat cue bid occurs above 3NT, so we give preference to bidding 3NT if we have the guard. But the repeat cue bid is still available as a general force and so can be used to find any major suit fit.)

The Chilli cue shunt can be used (a) when we are looking for 3NT and/or (b) when we are looking for a four-four major fit or (c) when we have nothing better to say, and requires no specific holding in any suit. It's more flexible than the Lebensohlic cue bid, and works without compromising the weak 2NT or having a nasty 'which way' memory load.

This is all lovely stuff for Chilli, but it did occur to me last week that the weak 2NT plus shunts set up was perfectly playable in any system. What you would need is some understanding of how to continue in a fit-like manner in your particular bidding system and – more importantly – just when it applies. Here at the Towers we smugly say 'always', and that's a choice that has a lot going for it.

Alan Williams
January 2009

The Chilli bidding system is described and defined at chillibidding.org.

Bridge over disturbed waters

I apologise to the more sensitive Chillians, but this post contains strong language which you may find offensive.

As you know, Chilli has three very distinct modes of operation: neutral, disturbed and fit, each with its own set of rules. Since early Chilli, both neutral and fit auctions have also had a distinctive character and a strong sense of structure built round the milestones in their respective worlds.

In neutral auctions, passage through or over the minor relays is a significant determinant of what will happen next; and later, the suit-setters provide a definitive 'end-of-term'. Fit auctions are even more driven by structure: as you progress, you pass inexorably through splinters, value expressions and finally asks.

But disturbed auctions have never had such a clear structure or such a distinctive feel. And clear as they are, there are definite practical problems associated with the disturbed rules as they stand. Consider these sequences:

1. 1 (2) dbl (4); ?


2. (2) dbl (pass) ?


3. 1 (pass) 1 (pass); 1 (pass) 2 (pass); ?

In sequence 1, we have suffered the very worst fate of a strong club system: we have made not one but two amorphous bids that show strength but conceal distribution, and we now have to decide what to do at a very high level. Surely responder should try a little harder to describe his hand? But currently he has no other forcing bids other than the equally amorphous 3.

In sequence 2, we face the same dilemma as in all other systems: how do we distinguish between a competitive try at the three-level and a genuinely game-invitational one?

In sequence 3, we have done the damage to ourselves by disturbing the auction with 2. This is fine if opener can now name the final contract, but if he has some powerhouse with spades, he's stuck for forcing continuations.

In thinking about these issues, sequence 2 naturally made me think 'Lebensohl' (I'm sorry, but I did warn you about the strong language at the top!) Most tournament players use some version of Lebensohl some of the time, and have some success with it. Its basics work well, distinguishing competitive hands (2NT) from invitational hands (3suit), and it would go a long way to solving some of the Chilli problem sequences.

But it does have a number of problems, both technical and psychological:

• The common-or-garden variety is demonstrably inferior to transfer versions (more dirty language ... sorry) because it cannot cope with unlimited hands
  
  
• Even the common-or-garden variety becomes prone to memory lapses once its basic function is complicated with Staymanic and guard-showing refinements
  
  
• Even more of a psychological problem is deciding and then remembering in which particular circumstances Lebensohl applies.

So putting on a Chilli hat, how could we use this? Suppose as in Lebensohl we make 2NT the weak bid, wanting to compete to the three-level, and use transfers to show better hands. But not just any old transfers ...

I have been fascinated for a long time by two-step transfers, where clubs transfers to hearts, diamonds to spades, hearts to clubs and spades to diamonds. They've been around in the fringes of bridge theory under many names, but partner Geoff came up with the natty name of shunts, an amalgam of sharps (diamonds and spades) and blunts (clubs and hearts).

Apart from putting majors first - very Chilli - shunts have the big advantage that you can break them in one of two ways; either below or above the anchor suit, and you can use this to express the different reasons why you broke.

Let's look how this will work. After 1NT (2) ?:

• 2NT is weak. Opener puppets to 3 and responder passes or names the final contract.


• 3 is a natural shunt to hearts with at least invitational values. Opener can:
  
  
  
  • complete the shunt to show a minimum hand with no great fit, after which responder can pass; any other continuation is forcing to game with normal disturbed rules
  
  
  • under-break with 3 to show heart support and make the auction fit
  
  
  • over-break with any other continuation, which is forcing to game with normal disturbed rules
  
  
• 3 is a cue shunt to spades with at least invitational values and inviting 3NT with spade stop. Opener can:
  
  
  
  • complete the shunt to show a minimum hand with no spade stop
  
  
  • under-break with 3 to show a maximum hand with no spade stop and nothing sensible to say
  
  
  • over-break with any other hand with no spade stop, which is forcing to game with normal disturbed rules


• 3 and 3 are natural shunts, with continuations similar to 3

I deliberately used a sequence that is by far the most common use of some sort of Lebensohl device. You can probably see that I can introduce into this scheme the same sort of Staymanic/guard jiggery-pokery of ordinary Lebensohl e.g. 2NT followed by 3NT could deny a guard (or show one, depending on what partner's name is). But I'm not going there for two reasons: one, it's confusing (to me and many of my partners, anyway) and two...

This is where we get back to basic Chilliosity. At the heart of the system is our belief in big universal rules. So let's have one here: let's play weak 2NT and shunts in all disturbed auctions where the bidding is currently below 2NT.

This then is the big new idea that Geoff, Peter and I have been trying out over the last few weeks with great success. Let's see how it helps on those original three problem sequences.

After 1 (2), responder now has a bag full of tricks: the weak 2NT, shunts into any of the suits and a cue shunt. If he still chooses double, then that's because he has invitational values, tolerance for the other three suits without a decent suit of his own, and no immediate desire to play in 3NT. If advancer does pop up with a pre-emptive 4 over this or any of the other possible bids, you can see that opener is in much better to judge what is happening.

(And pre-emption is the other reason you shouldn't mess with 2NT: if it always means weak, there is less ambiguity at high levels.)

After (2) dbl (pass) ?, responder can again choose to bid a weak 2NT or shunt - and is already better informed than he might have been since the doubler themselves could have used either of these options. Since we play potentially two-suited doubles, opposite a weak 2NT it is best for minimum doubler to bid his lowest suit rather than always rebidding 3.

After 1 (pass) 1 (pass); 1 (pass) 2 (pass); ?, once again we now have a full bag of tricks. For example, our powerhouse spade hand can be bid via a 3 shunt.

There's one type of shunt we haven't yet met. After 1 (2), 3 is a fit shunt, agreeing hearts and starting a fit auction. It replaces the current 2NT strong fit bid, which now has a new life as a weakling.

It's probably time to stop this very long post. We haven't even begun to understand the full subtleties of this change, and maybe we have yet to discover its big flaw. But it's been great fun playing it, and it feels like it's always been part of Chilli. No longer need disturbed auctions play Cinderella.

Alan Williams
December 2008

The Chilli bidding system is described and defined at chillibidding.org.