A support double, when used, is made when RHO overcalls partner's response, which may show only 4 cards. Here is an example: The double shows exactly 3 ♥s, then opener can decide whether to go on or do something else.
| Graph IRI | Count |
|---|---|
| http://dbkwik.webdatacommons.org | 15 |
![[RDF Data]](/fct/images/sw-rdf-blue.png)
