Posted 2014-January-21, 11:28
The first thing to observe is that East should not rebid 3♥. He has 19, and a pretty good 19 at that, and 3♥ is non-forcing. Precise strength limits will vary slightly amongst good players, but I don't think anyone would include this hand in that range.
This is an awkward hand, for that reason. The usual way of bidding it, absent specialized agreements, is to jumpshift into 3♣. The sequence 1♥ 1♠ 3♣ 4♣ 4♥ (and analogous sequences with opener rebidding 4♥) shows very good hearts and is an offer to play opposite even very short hearts, and this is necessary because 3♣ is 'suspect' even in old-fashioned standard American.
So:
1♥ 1♠
3♣ 3♠
Seems like the normal auction so far.
Opener's next action isn't clear. Ax in spades is pretty good support, but AKQJxx in hearts is a pretty good trump suit, and West hasn't promised the spades he actually has and we haven't shown the quality of our hearts.
I think I would bid 4♥ but I wouldn't say 4♠ was an error.
Over 4♥, West has a great hand. His partner jumpshifted, and he has 5 controls and a potential source of tricks.
I think keycard is ok at this stage. I often use kickback, but this would be an exception, since West has clearly biddable spades and hearts have not yet been agreed upon. So in my partnerships, even using kickback, this is a 4N call.
East shows 3 keys, which is huge for West given his spades.
West now asks for the Queen and East owns up to it and the club K via 6♣.
So far it may seem as if I have really just replicated the OP situation, but there is a subtle difference.
East has jumpshifted, promising a hand too good to rebid 3♥.
Furthermore, East has bid 4♥, suggesting we play in 4♥ even opposite shortness and weakness: West hasn't shown any strength beyond an initial 1♠ response. This isn't a strong inference but when coupled with the jumpshift I think it enough that West can see that grand will have good play.
The decision as to whether to bid grand depends on the form of scoring, the strength of the field, and one's expectations about one's own chances in the event.
At mps, in a decent field, you should definitely bid the grand. It is very difficult to construct a jumpshift hand, that rebids 4♥, where grand isn't at least 65% or so (68.5 for the 3-2 break minus the odd percent for weird breaks, like a ruff in spades on the opening lead), which makes the grand worth bidding. In a decent field virtually no-one misses the small.
At imps I'd always bid it. It will range from almost cold to at worst about 65%, so you can't stay out imo
Only at mps in a weak field is there any argument in favour of taking the small. One would have to conclude that significantly more people miss small than bid grand, and that would be an appallingly weak field. So long as the great majority of the field reaches at least small slam, you should bid a grand that is significantly above 50%, and this one is.
'one of the great markers of the advance of human kindness is the howls you will hear from the Men of God' Johann Hari