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One choice= draw trumps then play ♠A ♠K THEN PLAY ♠ J Pitching declarer diamond.

I agree with /badger and stop at 6♣on hand 2.

I am not sure there is a single correct answer as your methods might vary by seat and by event. In first or second seat fit is important so it might be wise to be able to ask for a feature and shortness. And responder needs to get support for a good side suit. It seems best to focus on level first and let judgment guide any slam tries. Also the Polish system of 2 suit hands works really well in many cases if we go away from 2/1 styles. Sounds like more research/sim might give you more insight. As very good question kind sir!

I prefer to play 2 ♥ here as invitation or invite+ so that it is a 1 round force. You can then react to partner's next call. If you bid 1 heart the first time you would not be able to bid 2 spades since that WOULD be a game force. A few well-documented long term partners might have a specialized bid that shows this hand with one bid. Every method has a drawback/compromise somewhere...

South should bid 6♦ over 4♠. He has the world's fair after such a strong sequence by North.

GIB uses 2S to show an unspecified short suit game try. Otherwise it would make sense to show a help suit game try in a hand of around 15+ HCP. 3H sounds like a minimum with no help in spades or no interest opposite any singleton. 4♦ depends upon what the agreement is as to 2♠. I would suggest a strong 6-4-3 hand with a void unsuitable for trying Blackwood in so far as the auction forces to game.

There was a system in use called "Shield" back in the 80s/90s. I don't remember it but maybe there is a reference out there somewhere. I do recommend reading Kit Woolsey's "Matchpoints" because he discusses when to open 1 NT with a 5 card major in some detail.

This result was entirely normal, even if playing semi-forcing by a passed hand. The robot had a hand that needed to bid (but a human would well consider passing 2H at matchpoints). For a look into the theory of 2/1 and 5 card majors, I would highly recommend the classic book "Morehead on Bidding" as republished by Richard L. Frey. That shows that systems have trade-offs and is the reason that The Polish Club has become so popular where 1Nt responses show about 8 to 12- high card points. In a high level event I might expect 2S down 1 to score above 50%. If not, unlucky...

Using some form of sign off over a reverse- 2NT gets you to 3♣. Otherwise Pass,

Need an agreement about that. 1)To expose a psych with you holding 5 or more stong spades. 2)interest in a one-suited minor slam holding a void in spades or the ace. 3) a 4-4-4-1 hand invitational to game.

While I do not use the LTC directly, it does work. For rubber or Chicago I suggest you find the original work by Howard Schenken that describes weak two bids as duel edged swords that can help your constructive efforts by thinking about the play will go at your target contract. It also keeps the players out of speculative overcalls to help for part scores.

Agree with 4♠but some days 1♠ depending upon how we play 1 NT. 2♣ is not bad, but I would would want something better than KJxx and Qx on the outside.

Negative double over 3C. At matchpoints I bid 4♥ and at Imps 3♦but those choices will be influenced by the relative aggressiveness of partner. The opponents might take a phantom save over 4♥and it figures to make fairly often since partner should hold either an unbalanced hand or latent support for spades.

Ever the optimist, I open 6♦-max benefit if correct and places pressure on the next hand.

The hand has a nasty flaw- xxx in hearts. So I underbid a bit knowing that GIB doesn't use logic insofar as suit quality and often jumps to ridiculous grands. So 4 dia and try to stop in some 6. So much for getting better- for that we need a regular partner!

Many years ago one of the best players in Florida told me to lead the nearest thing to a trick IF you have some hope of an entry. Here, the heart lead through dummy seems likely not to blow a trick and to perhaps set up a trick for partner. Now if pard turns out to hold an Ace plus the King of Diamonds or the diamond Ace and a stopper in a major then I will be sorry I did not do that. That advice has proved correct about 60 % of the time- in each case winning the match.

Conventions- great for firm partnerships, a nightmare for casual ones. You need agreements on some of these. I personally like jumps on this auction to show a very good 5 card side suit (4 in a pinch?. Raising clubs would allow for cue bidding, Key card or probing for the best spot. Three spades would show 6+ semi-solid or better quality setting up a force. 3NT would be to play suggesting running tricks. Could have extras versus more than a mini 2 clubs. I would guess that 3 NT in the other example would be a non-serious slam try, but really we need a partnership agreement. There are undoubtedly methods that would show a singleton or void over 2 clubs perhaps unspecified. It would be interesting to look at expert convention cards to see what they play. Thanks for this question!

Perhaps solid clubs, no diamond stopper- so partner do something intelligent. I suppose an alternative would be 6 clubs- 4 diamonds with good suits.

Bots do not teach good bridge habits. With a live partner I might double 3 diamonds and the bot might pass or bid hearts. The opponent bots might run back to clubs. I find so often the bots interpret a double as showing extra values and punish you for trying. So much for learning bridge, eh? I try not to play too many tournaments here as it tends to erode the quality of my bidding! I think some players bid wild trying anything to win because it seems normal play would win a live match , but here you need a crazy score to win.

All quite amusing. But, roll back to your first pass and change your call to double- you are too strong to pass. Later if you double I guarantee partner will do the right thing!

Pass in tempo and then 4 H. If only we play penalty doubles in this seat huh? I could punish partner I bid 5 ♣ telling partner to either bid his better or longer major or with better suits and the ♣A consider bidding a slam. Nice problem!

If you play a weak NT structure, then I call 7♣ otherwise my choice is also 5 NT. I wonder what Zia would do... Great discussion on the uncertainty with high level after 4th suit forcing to game!

No unless partner has extra values such as a great fit in clubs or an unbalanced 15+ hand. So bid 2♣inverted and see what partner shows. The real problem comes on the next round of bidding...

Looks like 2NT- warn partner of a possible misfit, BUT he knows I have spades as my longest suit. Other agreed upon system are OK. But I dislike intensely the proviso that partner has less than 3 card support as it will make further auctions very testy.

I decide to walk the dog with 2♠ planning to rebid 3. My thought is to buy it there and talk E-W out of 4♥ which I think might make. Against some opponents I would just bid 3♠ as that was my first instinct. My diamond card is encouraging but not sufficient to bid a mixed raise that shows a bit more defense.