Practice Hand 2 · Bidding · Deal 10 from A Bridge Guide, Ch. 26

Jacoby Transfer with 5-4 Majors

Why bid 3♥ after the transfer instead of jumping to 4♠?

North · 1NT Opener

♠A J 3
♥K 8 4
♦K Q 5 2
♣K J 9

17 HCP

South · Responder

♠K Q 9 5 2
♥A Q 7 3
♦8 4
♣7 3

11 HCP

Contract: 4♠ (bidding problem — no lead)
The Auction:
WestNorthEastSouth
Pass1NTPass2♥
Pass2♠Pass3♥
Pass4♠PassPass
Pass———
Your task: After North completes the spade transfer with 2♠, why does South bid 3♥ instead of simply bidding 4♠?

Solution

South is showing a second suit, not just one

South holds 5 spades AND 4 hearts. By bidding 3♥ after the transfer, South is saying: "I have 5 spades and 4 hearts — partner, you choose the best fit."

Why North picks 4♠

North holds 3 spades and 3 hearts. Both fits are equal in length (8 cards each), so North chooses on quality: the spade honours (♠AJ3) are stronger than the heart honours (♥K84). 4♠ it is.

If North had held 4 hearts and only 2 spades, North would have chosen 4♥ instead. The point is that South gives North enough information to find the best contract every time.

The rule

Always transfer to the 5-card major first, then show the 4-card major at the next opportunity. This sequence gives opener two pieces of information — both of your majors — before the partnership has to commit to a strain.

Key point: Bidding 4♠ directly hides your 4-card heart suit. When opener holds 4 hearts and only 2 spades, you'll play in your worst major fit. The transfer-then-show sequence prevents that.

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