Choosing Your Checkback:
NMF, Checkback, or XY NT?

Partner opens one of a suit, you respond at the one level, and partner rebids 1NT. You will sit in this seat again and again, holding anything from a weak hand that wants out to a game force that still needs more information. Bridge players — never content to leave a problem alone — have built a whole family of conventions for exactly this moment: New Minor Forcing, Checkback Stayman, and Two-Way New Minor Forcing — or XY NT, as we call it at home in Sweden.

They all tackle the same core auction. New Minor Forcing and 2C Checkback are two flavors of the same idea — a single artificial bid that asks — while XY NT adds a second artificial call to separate invitations from game forces. That precision has a price: more artificial sequences to remember, more natural bids surrendered, and more chances for a partnership misunderstanding. A convention only earns its place when what you gain at the table outweighs what you give up in complexity — so in this article I compare the trade-offs and finish with the checklist I wish every new partnership would sit down and fill in.

The problem: partner rebids 1NT

Here is the auction that causes all the trouble, seen from your seat as responder:

Partner has shown a limited balanced hand. The range is whatever your notrump-opening style leaves over: playing a strong 1NT opening, the rebid is usually about 12-14, or 12-13 for pairs that open 1NT with 14; playing a weak notrump, the 1NT rebid instead shows roughly 15-17. You, meanwhile, can hold very different hands:

• A weak hand that just wants out of notrump, in your suit or partner's suit.
• An invitational hand with a five-card major: the natural 2 is only a signoff, so how do you invite without overshooting?
• A balanced hand that simply wants to invite game in notrump.
• A game-forcing hand that still does not know the right strain: maybe a 5-3 major fit, maybe 3NT, maybe more.

Natural methods can assign clear meanings to your direct rebids: for example, two of your major can be a signoff and a jump to three of the major an invitation, normally with at least six cards. Their limitation is that one natural call cannot both describe your strength and ask partner about delayed support. The conventions below turn one or two of your cheap minor-suit rebids into artificial tools for that job.

Let me make it concrete. On the auction above, you pick up:

Eleven points and five spades: too good for a quiet 2 signoff, but a jump to 3 would overstate your length. You want to invite — and you want to know whether partner has three spades before choosing between spades and notrump.

At a glance

Option 1: one-way checkback (NMF or 2C Checkback)

The classic solutions use a single artificial bid. New Minor Forcing uses the unbid minor, so after 1 - 1 - 1NT the ask is 2. Checkback Stayman uses 2 every time, whatever partner opened. In both cases your artificial call promises nothing in the minor: it asks partner for delayed three-card support, an unbid four-card major, and sometimes minimum versus maximum strength.

The practical difference shows most clearly after a club opening. After 1 - 1 - 1NT, New Minor Forcing uses 2, preserving a natural club preference; fixed-2C Checkback uses 2, leaving 2 available for a natural diamond agreement. After a diamond opening, both methods normally use 2. After 1 - 1 - 1NT, most New Minor partnerships choose 2 as the ask, but it still belongs on the system card.

Pros: easy to learn, easy to remember, and it solves the central problem of finding a delayed 5-3 major fit. One-way checkback is where I point most new partnerships first.

Cons: in the common invitational-plus treatment, one bid has to carry both invitational and game-forcing hands. The partnership must therefore define which continuations force and whether opener shows support, the other major, or strength first. Some pairs instead play game-forcing-only NMF and route invitations elsewhere. You also give up a natural weak rebid in whichever minor is artificial.

Test your knowledge

You are playing New Minor Forcing with invitational-plus strength. Partner opened 1, you responded 1, and partner rebid 1NT, so the ask here is 2:

Option 2: Two-Way New Minor Forcing (XY NT)

Two-Way New Minor Forcing is also called Two-Way Checkback. At home in Sweden we call it XY NT, after the 1x - 1y - 1NT auction shape. It separates the strength bands by giving you two artificial bids. In the common strict-relay version, your 2 starts the invitational route or a weak diamond escape and forces partner to bid 2. Your direct 2 is an artificial game force.

After the relay, most of your natural continuations are nonforcing: partner may pass, choose a better part-score, or accept an invitation. The direct 2 route establishes the game force before partner describes shape, so the partnership cannot stop below game and can use lower calls to explore the strain. With a weak hand and long diamonds you can also bid 2 and pass the forced 2 in the strict-relay method.

Pros: the basic structure separates invitations from game-forcing inquiries, keeps invitational major-suit auctions low, and can provide a weak diamond escape. A subtler gain, and my favorite: you do more of the describing, so when partner ends up declaring, the defenders know less about the closed hand.

Cons: both minors lose their natural rebids, and the convention name does not define the relay breaks, direct 2NT, major-suit rebids, or opener's priority order. The extra precision only works when both players use the same agreements.

Test your knowledge

You are playing the strict-relay XY NT treatment described above — 2C forces 2D, and a direct 2D is a game force — in all three quizzes below. The auction so far is:

So which one should you play?

My honest answer: it depends less on the methods than on the partnership.

• Occasional partnership or newer players: New Minor Forcing or Checkback Stayman. One artificial call and one familiar trigger provide a reliable route to delayed major fits. Still write down the strength threshold and opener's response priorities.
• Regular partnership: Two-Way New Minor Forcing. This is often the best balance between precision and memory when both players can agree the follow-ups. It separates the normal invitational route from the direct game force, and it is very common at the expert level. It is also what I play myself, and what I would teach first once a partnership is ready to move beyond one-way checkback.

One deliberate omission is worth naming. The same 2C and 2D structure also extends to auctions where partner's rebid is one of a suit rather than 1NT. That fuller method is XYZ, which covers both the 1NT-rebid auctions on this page and the suit-rebid ones; some partnerships reserve the name XYZ for the suit-rebid version and keep calling the 1NT-rebid version Two-Way Checkback. The suit-rebid auctions bring different trade-offs — partner's suit rebid is not narrowly limited, and XYZ changes or replaces your usual Fourth Suit Forcing agreements in some of them — so treat them as their own upgrade once the 1NT-rebid package is solid.

Put these answers on your system card

• Your exact 1NT-rebid range and invitation threshold.
• Whether the method is on after interference, by a passed hand, and after minor-suit responses.
• Whether the 2C-to-2D relay is strict or may be broken.
• The meanings of direct and delayed 2NT, direct major rebids, and three-level jumps.
• Opener's priority between three-card support, the other major, and a descriptive minor rebid over the game force.

None of these two-level meanings carries over automatically after opener's jump to 2NT. That auction needs a separate strong-2NT-rebid agreement. Some pairs use a game-forcing checkback at the three level; others use the Wolff Signoff, whose classic and modified versions also require partnership discussion.

If you want to drill these auctions, practice the Checkback deal type on Cuebids with your chosen structure. For a repeatable partnership routine, use the steps in How to Practice Specific Bridge Bidding Topics. Playing the hands is how the agreements actually stick.

Thank you for reading this article and I hope you learned something!
Please share it with your bridge friends!

Emanuel Unge

Founder of Cuebids