XY Notrump convention
bidding convention in contract bridge
XY Notrump (also known as Two Way Checkback and Two Way New-Minor-Forcing) is a bidding convention in contract bridge.
Using the convention
After opener's one of a suit (X), partner's one of a suit response (Y) and opener's 1NT rebid (a very common sequence), 2♣ from opener's partner forces 2♦ from opener. Holding a weak hand with diamonds, one can now pass. Other bids are invitational, describing also the nature of the hand. A 2♦ response to 1NT, however, is game forcing with any hand. Responder may also jump to 3 of any suit (except 3♣, which is signoff) to show a slam-invitational hand with good suit(s).
Examples
For example, on the sequence 1♣-1♠ (with or without opponent's interfering);1NT-2♣;2♦,2♥ will show an invitational hand with minimum five spades and four hearts, 2♠ an invitational hand with minimum five spades (in which case one does not have four hearts) or possibly six spades with or without four hearts. 2NT will show a balanced invitational hand, 3♣ typically an unbalanced invitational hand with club support. However, when one instead forces game with 2♦, opener will immediately start describing his own hand. He may, on basis of the aforementioned auction, with 2♦ being the only difference, bid 2♥ holding four hearts, 2♠ holding three card spade support, etc.
Begin with the source’s own compact description: “XY Notrump convention” is bidding convention in contract bridge. The dossier treats that line as a proposition to test through Notrump, convention and bidding, not as a finished interpretation.
Why this record matters
The phrase “bidding convention in contract bridge” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Maps, plans, fabric surveys and administrative records can establish how the site’s name, extent and function changed over time. The source revision retrieved here is dated Apr 21, 2026. The linked authority identifier is Q8042675. None of the 0 selected statements returned an explicit reference.
A single description cannot reconcile every naming convention, rebuilding phase or administrative transfer associated with a place. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
- Historic place names
- Jurisdictional context
- Routes into maps and plans
Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
- Establish the record: confirm the title “XY Notrump convention”, its source revision and the description used here.
- Expand the search: follow XY Notrump convention primary sources, XY Notrump convention archive and Notrump research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
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- What physical evidence or contemporary plan supports the description?
Search terms from this dossier
This entry incorporates text from “XY Notrump convention” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.