Fit Jumps 2017-12-16 Hand 14

Board 14 North Deals	♠ 9 ♥ A J 10 3 ♦ Q 10 6 4 ♣ A J 7 2
♠ J 3 2 ♥ 7 2 ♦ J 3 ♣ K Q 10 9 6 4	N W E S	♠ K 8 7 6 5 ♥ 9 8 5 4 ♦ 9 8 2 ♣ 3
	♠ A Q 10 4 ♥ K Q 6 ♦ A K 7 5 ♣ 8 5

West	North	East	South
	1 ♦	Pass	2 ♠
Pass	3 ♣	Pass	3 ♦
Pass	3 NT	Pass	4 NT
Pass	6 ♦	All pass

6 ♦ by North

Lead: ♥ 4

Made 7 — NS +940

Here 3 ♣ shows a second suit and 3 ♦ is normally minimum but could be a slam try. The 3 ♦ rebid denies a singleton heart at least. Showing a singleton club is difficult. Without a singleton or void responder's only ways to show extra values are 4 ♦ or possibly 3 NT but we have not settled on an appropriate range for 3 NT. Responder's next bid of 4 NT reveals the slam try.

Opener has shown around 12-14. The 1=4=4=4 shape is bad - no trump length. And there are only 12 hcp. However two aces and the ♦ Q are all working and we know there are not two quick losers in spades. Perhaps the jump to 6 ♦ is optimistic but the contract can make seven with just one finesse.

An artificial system option to be able to show the club singleton is to swap opener's 3 ♣ and 3 ♦ rebids. With 3 ♣ showing diamonds and 3 ♦ showing clubs but with extra values. Over 3 ♣, showing diamonds, this allows responder to bid 3 ♦ with a club singleton and three of the other major to show a singleton there.

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