Jacoby Transfers

Bid the suit below the one you actually hold, and let the strong hand declare.

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The Mechanism#

Over partner's 1NT, you bid the suit immediately below the major you actually hold, and opener is obliged to bid the major itself:

Opener has no choice in the matter and no discretion — the completion is automatic, made on any holding, and says nothing about opener's hand at all. That is the whole point: the bid is a command, not a suggestion, so the auction arrives at a known place and responder gets to decide what happens there.

Note what a transfer does not say. It promises five cards in the major and nothing whatever about strength. A Yarborough with five spades and a hand worth a slam both start the same way.

The Two Things It Gains#

The strong hand declares. This is the reason the convention exists. If responder simply bid 2♠ naturally, responder would be declarer and the opening lead would come through opener's tenaces — through the K-J, through the A-Q — which is where a defender wants to be leading. Transfer, and opener plays the hand: now the lead comes up to those holdings, and the same cards take an extra trick roughly as often as not. Opener's honours also stay concealed through the opening lead, so the defence is guessing.

Weak hands get to play in the right suit. Without transfers, responder holding six spades and two points has no way to say so at a level the hand can afford. With them, 2♥ followed by pass lands the contract in 2♠ — which will usually make more tricks, and certainly go down fewer, than 1NT played with a bust opposite. The transfer is as much an escape hatch as a constructive tool.

Placing the Contract Afterwards#

Because the transfer promised nothing about strength, the bid you make after opener completes it is where you describe the hand. There are three options and they map straight onto the three kinds of hand:

• Pass. Weak with a long major. The transfer has done its job and the part-score is where you want to be.
• Raise to three. Invitational. Opener passes with a minimum and bids the game with a maximum.
• Bid the game. Enough opposite opener's minimum. Do not invite on a hand that is worth game facing the worst 1NT partner could hold.

That last distinction is the one worth internalising, and it is the one the robots use: bid game when partner's minimum gets you there, and invite only when you need partner's maximum. Hands that jump to game on values that merely might be enough take the decision away from the player who knows more about it.

Stayman or Transfer?#

Both conventions live over the same 1NT opening and it is easy to reach for the wrong one. The rule is about length, not strength.

• Four cards in a major: Stayman. You are looking for four opposite four, which only the ask can find.
• Five or more: transfer. You do not need to find anything — opener holding three is already an eight-card fit — and transferring buys you the declarer advantage as well.
• Five in one and four in the other: transfer to the five-card suit first, then bid the four-card one. The auction shows both, in the right order, and still lets opener choose.
• Five in each: transfer to spades. Play the higher-ranking suit — if the partnership belongs in hearts instead, there is still room to find that below game.

Transfers With a Part-score On#

In rubber bridge, what counts as "the game" depends on the pad, and a transfer auction has to respect that the same way a Stayman auction does.

With 60 already below the line, opener's completion at 2♠ is not a waypoint on the road to 4♠ — it is the contract that finishes the game. Pass it. Bidding on to four is asking for two more tricks you have no need of, at a vulnerability you may well have just acquired.

Rase's engine folds the part-score into this calculation directly: if completing the transfer has already reached the level that scores the game, it passes and takes it. If not, it uses the same two thresholds as always — game opposite a minimum, invite opposite a maximum — measured against the shorter distance the pad has left.

When the Switch Is Off#

Transfers are on by default in both 2/1 and ACOL, and they can be turned off from System & Conventions in Settings. With the switch off, 2♦ and 2♥ over 1NT revert to natural weak takeouts: they show the suit bid, they are not forcing, and opener is expected to pass.

That is a playable structure — it was the standard one for decades — but it gives up both of the gains above, and it leaves responder with no way to invite game in a major at all. If you turn transfers off, expect the robots to bid and defend as though the weak takeout is what 2♦ means, because it is.