The XYZ convention is a set of responder's rebids after any auction where three bids are made at the one level: opener bids X, responder bids Y, opener rebids Z (including 1NT). Responder's 2♣ is a puppet that forces opener to bid 2♦, used for weak hands with diamonds and for all invitational hands. Responder's 2♦ is an artificial game force.
XYZ is an expert treatment that fits well with Standard American and 2/1 Game Force. It is not part of SAYC or standard Acol, so use it only when your partner has agreed it.
How the XYZ Convention Works
Natural methods have a problem after a one-level rebid. In 1♣ - 1♥ - 1♠, how does responder invite game with five hearts, or force with no clear bid? New minor forcing and fourth suit forcing each solve part of it, but each mixes invitational and game-forcing hands in one bid.
XYZ splits them cleanly:
| Responder bids | Meaning |
|---|---|
| 2♣ | Puppet to 2♦: a weak hand with diamonds, or any invitational hand |
| 2♦ | Artificial, forcing to game |
| 2 of own suit | Weak, to play |
| Simple preference or raise | Weak, to play |
| 2NT | Partnership choice: often a puppet to 3♣ for a weak club hand |
| Jumps to three | Partnership choice: natural game force with slam interest, or invitational |
Because every invitation goes through 2♣, opener always knows the strength: after 2♣, responder's next bid is at most invitational; after 2♦, the partnership is in a game force.
Where XYZ Applies
XYZ applies when the first three bids are all at the one level, for example:
- 1♣ - 1♦ - 1♥ or 1♠
- 1♣ - 1♥ - 1♠
- 1♦ - 1♥ - 1♠
- 1♣ - 1♥ - 1NT, 1♦ - 1♠ - 1NT and the other 1NT rebids
It does not apply after a two-level rebid (1♦ - 1♥ - 2♣) or after a jump. Most pairs also turn it off when the opponents bid or double, and some turn it off for a passed-hand responder. Agree both points before you sit down.
Notice the overlap with the fourth suit. After 1♦ - 1♥ - 1♠, natural methods play 2♣ as fourth suit forcing. In XYZ, 2♣ is the puppet, and the game-forcing hand bids 2♦ instead.
Opener's Answers
After the 2♣ Puppet
Opener bids 2♦, whatever the hand. Some pairs let opener break the puppet with a maximum and three-card support, but the simple rule is: always 2♦.
Responder then shows the hand:
| After 1♣ - 1♥ - 1♠ - 2♣ - 2♦ | Meaning |
|---|---|
| Pass | Weak hand with long diamonds |
| 2♥ | Invitational, five hearts |
| 2♠ | Invitational, four spades |
| 2NT | Invitational, balanced, no fit |
| 3♣ | Invitational, club support |
| 3♥ | Invitational, six hearts |
Opener passes with a minimum or bids game with a maximum. With a fit and a maximum, opener can bid game in the fit.
After the 2♦ Game Force
Opener describes the hand naturally, in this order:
- Three-card support for responder's major: raise to two of it.
- Extra length: rebid a five-card or longer suit.
- A stopper in the unbid suit: bid 2NT.
- Four cards in the unbid major (only after a 1NT rebid): bid it.
No bid below game can be passed, so opener never needs to jump. This leaves room for responder to show slam interest with a cheap bid.
Rule of ThumbWith XYZ, 2♣ means "invitational or weak with diamonds" and 2♦ means "game forcing". The bid tells opener the strength at once, before any suit is named.
Example Deal
South's 2♦ is the artificial game force. North shows three hearts with 2♥, and South bids game.
North opens 1♣ and rebids 1♠. South has 14 HCP with five hearts.
South has 14 HCP and five hearts: enough for game, not sure which one. In natural methods South would bid 2♦ as fourth suit forcing and hope partner reads it as game forcing. In XYZ the bid is defined: 2♦ forces to game. You can see how each system reads South's 2♦ here.
North holds 13 HCP with three hearts, so North raises to 2♥. That is not a weak bid: the game force is already set. South knows about the 5-3 fit and bids 4♥. With no extra values for slam (the side has about 27 HCP and no great source of tricks), South stops there.
On this layout 3NT would also make: a double dummy solver gives eleven tricks in both 4♥ and 3NT. At the table South cannot see the diamonds: with ♦72 opposite ♦KQ6, notrump depends on where the ♦A and the long diamonds sit. The heart game, with dummy's short diamonds able to ruff, is the contract you want to reach.
Judgment and Trade-offs
XYZ is not free. Here is what you give up and what you get:
- You lose the natural 2♣ rebid. After 1♦ - 1♥ - 1♠ you cannot play in 2♣. With a weak hand and long clubs you need the 2NT puppet to 3♣, if you play it.
- You lose some bidding space. The 2♣ - 2♦ relay uses a round, so an invitation in hearts happens at 2♥ instead of a natural 3♥. In practice this is a gain: invitations at the two level are cheaper.
- Memory load. Both partners must spot every XYZ auction at once. The classic disaster is a partner who passes 2♣ because "it was clubs".
- You gain clarity. Every hand sorts into weak, invitational, or game forcing on the first rebid. Slam bidding becomes much easier when the force is set at the two level.
XYZ Compared With Other Checkback Methods
| Method | Where it applies | Invitational | Game forcing |
|---|---|---|---|
| New minor forcing | After a 1NT rebid | Unbid minor | Same bid, then more |
| Checkback Stayman | After a 1NT rebid | 2♣ | Same bid, then more |
| Two-way new minor forcing | After a 1NT rebid | 2♣ puppet | 2♦ |
| Fourth suit forcing | After three suits | Fourth suit, one round | Fourth suit, often GF |
| XYZ | After any one-level rebid | 2♣ puppet | 2♦ |
XYZ is two-way new minor forcing extended to every one-level rebid, not only 1NT. If you already play two-way NMF, XYZ adds very little new to learn.
The Full XYZ Tree
A compact version of what to write on your convention card:
- 2♣: puppet to 2♦. Then pass = weak with diamonds; any other bid = invitational and natural.
- 2♦: game force, artificial. Opener shows support, length, stoppers in that order.
- 2 of responder's suit: weak, to play.
- Preference to opener's first suit or a raise of opener's second suit: weak, to play.
- 2NT: puppet to 3♣, then pass or a weak correction (optional).
- Three-level jumps: agree whether they are invitational or slam-going game forces.
- After interference: off, natural methods.
Practice: XYZ
Partner opens 1♣ and rebids 1NT. You play XYZ. Your call?
You play XYZ. You hold five hearts and 11 HCP. Partner opened 1♣ and rebid 1NT (12-14). What do you bid?
Your hand:
XYZ is easy to read about and harder to remember at the table. BridgeDummy's bidding puzzles give you a real auction and test each call over many deals that fit it, so you can see when the invitation or the game force pays off. To build the habit, bid deals in the Bidding Room with a partner who plays the same methods. The ideas behind XYZ also appear in two over one game force.