The GIBBO response structure for 2C is pathetic. It's bad in many ways, with the worst of all being its monumentally stupid use of the 2NT response. I have railed against that many times and I have also explained in detail why that particular part of the system is lunacy for a multitude of reasons.
This post is also about the miserable 2C system, but in this case it does not involve the insane 2NT response.
Here, after 2C by South, 2D waiting by famed dimwit Sylvester Balboa in the North, and 2H by South, Balboa bids 3C, defined very poorly (as usual for a GIB definition) as "Cheaper minor - forcing to 3H". Note that those entirely USELESS five words say absolutely NOTHING - NOTHING (!) - about North's hand. You would think that in a DECENT system (obviously not the trash called GIB!) a DECENT player (obviously not a braindead twerp such as a GIB/GIBBO robot!) would want to...DUH...actually provide useful info to help his partner. Whoever designed the useless trash that passes for GIB's system and definitions apparently is unaware that this might be a good strategy.
Since it's a matchpoint game, South decides to go for the gusto by bidding 3NT. His braindead "partner" Balboa then does what these imbecilic GIB/GIBBO monstrosities so often LOVE to do: He blithely, stupidly, unilaterally, and completely unscientifically makes an insane leap to 6NT, wasting a full three levels of bidding where the partnership might have been able to intelligently discern the best contract.
In addition to all the obvious lunacy of Balboa's call, the ignorant GIBBO M.O.R.O.N. doesn't even have either the wit or the discipline to follow his own GIB definition of 6NT, which says that it shows "8-10 HCP". Superstooge Balboa has only six HCP.
All pass, and West leads the spade 3 against 6NT. Declarer South sees that even if enemy hearts break 3-3, and even if the diamond ace is onside, the hand, barring some sort of miracle in the black suits (such as QJ dub in either, or a stiff jack or queen of clubs in the East...followed by a successful guess of the club layout) has virtually no play. Consequently, declarer decides to play for a swindle or a defensive error. He wins his stiff spade ace at trick one and leads his club TEN (from A108) towards dummy South's K9762. He is hoping that West will cover, and he (South) will then NOT win dummy's king. If clubs are 3-2, or if West has the enemy club length, South might be able to take four club tricks (if East does not overtake a potential West jack with a potential East queen). If all that happens, declarer will have a chance...as long as EAST has the diamond ace and West fails to find a diamond shift after winning his hoped-for club honour.
A lot of luck will be required, but desperate times call for desperate measures! South crosses his fingers and leads the club 10. Good news...MAYBE...because West covers with the JACK. Declarer would have preferred to see the QUEEN, because he REALLY doesn't want East to overtake with a potential queen and then find a diamond shift.
Declarer crosses his fingers again and follows through with his plan by playing dummy's 2 (from K9762). East plays the...THREE of clubs. So far, so good, but the slam is still FAR from a given. Just to BEGIN with, the defenders can now IMMEDIATELY beat it (by cashing the diamond ace) if West finds a diamond shift. And even if West DOESN'T find a diamond shift, declarer will still need to hope for a 3-3 enemy heart break...AND to find a TWELFTH trick (with a GOOD chance of now doing so in clubs, or barring that, perhaps through a squeeze).
At trick three, West plays...the FIVE OF CLUBS (!), because these stone cold C.R.E.T.I.N.S....stupidly LOVE to play the suit DECLARER is playing. But in any case: Phew (!) because West FAILED to find the OBVIOUS diamond shift. There's still hope! Declarer plays dummy's 6 and is pleased to see that East follows with the 4. Declarer wins his ace. He is now guaranteed 4 club tricks in all (including the ace he just won) and 2 spade tricks in all (including the stiff ace he won at trick one). That adds up to six...but he STILL needs hearts 3-3. If that happens he will actually have THIRTEEN tricks, but will obviously be credited with "only" twelve, since West has already won a trick. But he will MAKE his virtually impossible slam. If hearts DON'T break 3-3, he'll be down...possibly a FEW tricks. He can cash out for down three, but that probably won't matchpoint very well!
Lo and behold, South's luck is IN, because hearts ARE 3-3 (hallelujah!), so he takes 12 tricks and rolls up his slam. Needless to say, he scores 100 % on the board...but HERE is the punchline: WEST had the ace of diamonds! WEST, who WON trick two with his club jack,...did not cash the setting trick with his diamond ACE at trick three! This unbelievable GIBBP I.D.I.O.T. thought it was a MUCH better play to...continue CLUBS, the suit DECLARER was playing!
This is an example of how UTTERLY, MIND-BLOWINGLY hopeless these GIBBO pieces of garbage are!
https://www.bridgeba...H6%7Cmc%7C12%7C

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