These opening bids are named after Mr. Yui-Bin Chen, who is a famous Blackjack and Poker player, among other card games. They employ the opening of 4-card Major suits and very weak 1 No Trump opening.
Mr. Yui-Bin Chen, or his fans, developed opening bids for favorable and for non-favorable vulnerability, the second of which is listed in the second schematic.
By non-favorable vulnerability, the opening of a Major suit on the two level corresponds to the Acol Two opening bids. The opening bids also take into account the seat of the opener, which is shown only in the first schematic. The principle of canapé is employed after any one level opening bid besides 1 Club.
The student of bridge must be aware that the application of these opening bids must first be submitted to the sponsoring organization before the event. Source.
Opening Bids Only
| Favorable Vulnerability |
| Bid |
|
Strength |
|
Meaning |
1  : |
|
16+ high card points |
|
Shows any shape, or |
| |
|
18+ high card points |
|
shows any shape in Third and Fourth Seat. |
1  : |
|
11-15 high card points |
|
Promises a 4-card plus Diamond suit or balanced shape. |
1  : |
|
11-15 high card points |
|
Promises a 4-card plus Heart suit. |
1  : |
|
11-15 high card points |
|
Promises a 4-card plus Spade suit. |
| 1 NT: |
|
10-12 high card points |
|
Shows balanced shape, or |
| |
|
16-18 high card points |
|
shows balanced shape in Third and Fourth Seat. |
| 2 : |
|
11-15 high card points |
|
Promises a 5-card plus Club suit. |
| 2 : |
|
7-10 high card points |
|
Promises 6 Hearts or Spades. |
| 2 : |
|
11-15 high card points |
|
Promises a 4-card plus Heart suit and a 5-card plus Spade suit. |
| 2 : |
|
|
|
Promises a weak preempt in any unspecified suit. |
| 2NT: |
|
7-10 high card points |
|
Distribution: 5-5 plus in both Minor suits. |
| |
|
|
|
|
| Non-Favorable Vulnerability |
| Bid |
|
Strength |
|
Meaning |
| 1 : |
|
13-21 high card points |
|
Promises a 4-card plus Club suit. |
| 1 : |
|
13-21 high card points |
|
Promises a 4-card plus Diamond suit. |
| 1 : |
|
13-21 high card points |
|
Promises a 4-card plus Heart suit. |
| 1 : |
|
13-21 high card points |
|
Promises a 4-card plus Spade suit. |
| 1 NT: |
|
15-17 high card points |
|
Shows balanced shape. |
| 2 : |
|
22+ high card points |
|
Shows any suit except the Diamond suit, or |
| |
|
20-21 high card points |
|
shows balanced shape, or |
| |
|
26-27 high card points |
|
shows balanced shape. |
| 2 : |
|
22+ high card points |
|
Promises a 5-card plus Diamond suit, or |
| |
|
22+ high card points |
|
distribution: any 4-4-4-1 shape, or |
| |
|
28+ high card points |
|
shows balanced shape. |
| 2 : |
|
18+ high card points |
|
Promises a 5-card plus Heart suit. |
| 2 : |
|
18+ high card points |
|
Promises a 5-card plus Spade suit. |
| 2NT: |
|
24-25 high card points |
|
Shows balanced shape. |
If you wish to include this feature, or any other feature, of the game of bridge in your partnership agreement, then please make certain that the concept is understood by both partners. Be aware whether or not the feature is alertable or not and whether an announcement should or must be made. Check with the governing body and/or the bridge district and/or the bridge unit prior to the game to establish the guidelines applied. Please include the particular feature on your convention card in order that your opponents are also aware of this feature during the bidding process, since this information must be made known to them according to the Laws of Duplicate Contract Bridge. We do not always include the procedure regarding Alerts and/or Announcements, since these regulations are changed and revised during time by the governing body. It is our intention only to present the information as concisely and as accurately as possible.