A site for bridge bidding systems with a strong artificial 1♦
This site's purpose is to popularise strong diamond systems and compatible conventions because we believe they offer significant advantages over other widely used systems.
However, we aim to be a site of innovation, so even if you don't play a strong diamond you'll be able to pick up some great conventions that fit well with any system. For instance most of the system's advantages can be incorporated into the Strong 1♣ variant of the system or Forcing 1♣ that isn't always strong (See Links for full details).
I also intend to add pages to summarize my research. I currently have a database of around a quarter of a million hands from major bridge competitions on which I can test bidding theories.
Nigel Jones and Hallam Corbett-Jones England 2012
Jones Diamond System
Nigel Jones & Hallam Corbett-Jones
First Draft 2004 Updated December 2012
This system is level 4 in the English Bridge Union’s Orange Book. It’s also fit in the American Contract Bridge League list of conventions. Click on the opening bid to see a full description of continuations.
*I've used the usual Bridge terminology of naming the system after the person who formalised it, so that it can be distinguished from other strong diamond systems. I don't claim credit for all the conventions defined here.
The Jones Diamond System* was largely developed whilst playing a strong club system in England in the 1990s. Many thanks to William Tunstall-Pedoe for his patience and help in those days playing bridge for Cambridge University and the Cambridge City Bridge Clubs. I was inspired to fully document and formalise the system by playing with my son Hallam Corbett-Jones.
I intend to update the conventions and convention card as we develop the system, keeping version numbers in case you want to play a specific version.
If you have any other strong diamond systems or compatible conventions please send them to us and we'll include them or add your links.
Most Useful Conventions
For those of you who don't play a strong diamond these are probably the most interesting conventions...
Responses to 1NT - an alternative to Stayman and transfers over 1NT.
Jones Penalty Traps - the opponents are not allowed to play in any contract un-doubled once we have shown a minimum of 22 HCP.
Our Treatment of Baron 1NT over-call and strong take-out X 15+. These conventions remove the ambiguity of a take-out double and allow rapid pre-empts.
Wild pre-emptive style playable in strong club and various forcing club systems.
Here's the latest and original versions of the strong diamond card...