Roudi Convention
This
conventional method was devised by Mr. Jean-Marc Roudinesco of France.
This conventional method is popular in the country of France and is applied
after the opener has rebid 1NT after a suit opening. With a forcing 2
rebid by the responder the opener is required to further clarify his
holding. The following illustration should clarify the concept:
When responder first bids a spade they promise at least a 5 card spade suit.
If opener rebids 1NT it is forcing for one round.
2 bid by responder is an automatic relay to allow opener to more accurately describe his holding.
After 1 /
/
- Pass - 1 
- Pass - 1NT, then 2 asks. responses are:
- 2 - shows no fit in spades and 11/12 points
- 2 - shows a fit in spades and 11/12 points
- 2 - shows a fit in spades and 13/14 points
- 2NT - shows no fit in spades and 13/14 points.
Whenever
the responder first bids 1, then the responder is promising a 5-card plus
Spade suit, distributional points not included.
The opening bid is rather irrelevant as long as it is not Spades.
When the
opener rebids 1NT, then the responder must bid 2, as in the
following diagram to ask opener for additional information regarding his
holding:
Once the responder is aware either of the fit and/or no-fit in Spades, then the responder will set the contract accordingly.
Note: A
second rebid by the responder of 2NT instead of 2 is played by some partnerships as a mandatory puppet to 3 in order to either cease the auction in this suit and at
this level, or as a forcing rebid to describe holdings with strong values, or to
invite to a final contract of 3NT.
Partnership agreement.
The responder can also show a 5-card Spade suit when the values are less than 10 high card points in the following manner. This shows a 5-card Spade suit and fewer than 10 points. The opener, with this additional information, will then become the captain and set the final contract.
1 // - Pass - 1 - Pass - 1NT, then 2
After opener rebids 2/, responder now bids 2