JCBL CONVENTION LIST
Disallowed for games applying List A - D:
1. Conventions and/or agreements whose primary purpose is to destroy the opponents' methods.
2. Psyching of artificial or conventional opening bids and/or conventional responses thereto.
Psyching conventional responses to natural openings which are less than 2NT.
3. Psychic controls.
4. Forcing pass systems.
5. Relay (tell me more) systems.
6. Opening one bids which by partnership agreement could show fewer than 8 HCP.
(Not applicable to a psych)
LIST A (for games less than 20 master points)
Opening bids
1. 2
opening, forcing, strong and artificial.
Responses and rebids
1.Stayman Club response.
2. 2
negative response to forcing 2 opening.
3. 2NT negative response to natural, strong two bids.
4. 2NT response to weak two bid (Min. 5 HCP, Max. 7 HCP spread, Min. 5-cards) to ask for feature, strength and / or trump quality.
5. 4NT Ace and 5NT King asking conventions and responses to handle interference.
6. Gerber.
7. Grand Slam Force.
8. If the 1NT opening has a point range which exceeds 5 HCP, or if the 1NT opening has an agreed lower limit of fewer than 15 HCP, responses and rebids may not be conventional - they must be natural.
9. Naturaul jump shift, guaranteeing opener's suit support (Fit showing jump).
Competitive Bids
1. Unusual notrump (by an unpassed hand must be at two level or higher).
2. Takeout double.
3. Lightner double.
4. Negative double.
5. SOS Redouble.
6. Cuebid for strong takeout.
Carding
1. Fourth highest;
Top of nothing / MUD;
Top of touching honors / King from AK / Ace from AK;
2. Normal attitude / count / suit-preference signals.
LIST B (for games less than 300 master points)
Opening bids
1. 1 storng and artificial opening minimum of 15 HCP（Precision 1 etc）, and/or 1 or 1 may be used as an all-purpose opening bid (artificial or natural) promising minimum of 10 HCP.（Natural 1 with 2+cards : conventional responses may not use, Precision 1 etc ）
2. 2 artificial opening bid showing one of:
a) 5
+4
, min.10HCP,max 5 HCP spread. (Flannery)
b) a three suiter with a minimum of 10 HCP (Precision 2 etc.)
c) Schenken 2
4. Gambling 3NT.
Responses and rebids
1. 1 as a forcing, artificial response to 1.
2. 1NT response to a major suit opening bid forcing one round; cannot guarantee game invitational or better values
3. Drury Fit.
4. Jacoby 2NT.
5. Artificial forcing major raises (Swiss 4 / 4, Splinter, 3NT)
6. Artificial forcing minor raises
a) Crisscross (Jump shift response to the other minor)
b) Splinter (Double jump shift)
7. Artificial bids over strong (15+ HCP), forcing opening bids and after opening bids of 2 or higher (for this classification, by partnership agreement, weak 2 bids must not be fewer than 5 HCP, must be within a range of 7 HCP and the suit must contain at least 5 cards).
8. All constructive calls starting with the opening bidder's second call
(splinter by opener、Fourth suit and new minor forcing etc）
9. Calls that ask for aces, kings, queens, singleton, voids, trump quality and responses thereto
10. All calls after natural notrump (including those that have two non-consecutive ranges neither of which exceeds 3 HCP).No conventional responses are allowed over natural notrump bids with a lower limit of fewer than 12 HCP or with a range of greater than 5 HCP. Futher, a conventional defense is not permitted.
Competitive Bids
1. Conventional doubles and redoubles.
2. 2NT over opponent's takeout double, showing opener's suit support. (Truscott 2NT etc.)
3. Cuebid to show a specified major and another suit. (Michaels,colorful etc)
4. Lebensohl.
5. Defense to:
a) artificial strong 1.
b) natural notrump opening bids and overcalls.(Landy,Ripstra,Astro,Cappelletti/Hamilton)
c) opening bids of 2 or higher.
6. No.5 through 10 under ‘Responses and Rebids’ above apply both pairs.
Carding
1.3rd highest,5th highest,lowest.
LIST C (for open games)
Opening Bids
1. 1 or 1 may be used as an all-purpose opening bid (artificial or natural)
promising minimum of 10 HCP. (Precision 1, 1 and Polish 1 etc.)
2. 2 artificial opening bid indicating one of:
a) a strong hand, balanced or unbalanced
b) a three suiter with a minimum of 10 HCP (Roman 3 suiter etc)
3. 2 artificial opening bid showing one of:
a) both majors with a minimum of 10 HCP (Flannery, anti-Flannery etc)
b) strong hand, balanced or unbalanced (including Schenken2)
c) a three suiter with a minimum of 10 HCP (Roman 3 suiter etc)
4. Opening suit bid at two level or higher indicating the bid suit, another known suit, a minimum of 10 HCP and at least 5-4 distribution in the suits.
5. Opening notrump bid at the two level or higher indicating at least 5-4 distribution in the minors, 10 or more HCP.
6. Opening 3NT bid indicating:
a) any solid suit or
b) a broken minor suit.
7. Opening four-level bid transferring to a known suit. (Namyats etc)
Responses and Rebids
1. 1 as a forcing ,artificial response to 1.
2. 1NT response to a major suit opening bid, forcing one round; cannot guarantee game invitational or better values
3. Conventional responses which guarantee game forcing or better values.May not be part of a relay system.
4. 2 or 2 response to 3rd or 4th seat major suit opener asking the quality of opening bid
5. Single or higher jump shifts (including into notrump) to indicate a raise or to force to game.
6. Artificial bids over strong (15+ HCP), forcing opening bids and after opening bids of 2 or higher (for this classification, by partnership agreement, weak 2 bids must not be fewer than 5 HCP, must be within a range of 7 HCP and the suit must contain at least 5 cards).
7. All constructive calls starting with the opening bidder's second call
8. Calls that ask for aces, kings, queens, singleton, voids, trump quality and responses thereto.
9. All calls after a natural notrump (including those that have two non-consecutive ranges neither of which exceeds 3 HCP). No conventional responses are allowed over natural notrump bids with a lower limit of fewer than 10 HCP or with a range of greater than 5 HCP .Futher, a conventional defense is not permitted.
Competitive Bids
1. Any conventional balancing calls
2. Conventional doubles and redoubles and responses (including freebids)thereto.
3. Notrump overcall for either:
a) two suit takeout showing at least 5-4 distribution and at least one known suit,
(At the 4 level or higher there is no requirement to have a known suit)
b) three suit takeout (as with a takeout double, at least 3 cards in each of the 3 suits).
4. Jump overcalls into a suit to indicate at least 5-4 distribution in two known suits, and responses thereto.
5. Cuebid of an opponent's suit and responses thereto, except that a cuebid that could be weak,directly over an opening bid, must show at least one known suit.
6. Comic 1NT overcall
7. Defense to:
a) conventional calls. (including takeout double)
b) natural notrump opening bids and overcalls.
c) opening bids of 2 or higher.
8. No. 5 through 9 under ‘Responses and Rebids’ above apply both pairs.
Carding
1. All leads and signaling methods are approved.except for
a) odd-even signals,
b) Encrypted signals,
c) Dual message carding strategies except on each defender's first discard,
d) Any method when they are deemed to be playing it in a manner which is not compatible with the maintenance of proper tempo.
LIST D [for IMP League-Open and the highest flight of open games in which contestants play segments (no change of opponents) of 6 or more boards, regional or higher rating and 2 or more sessions (Sponsor may limit to List C) ]
Opening Bids
1. Opening suit bid at the two level, promising five or more cards in the bid suit.
2. Multi 2 opening bid showing at least two of:
a) a weak two (five or more cards).
b) a weak two (five or more cards).
c) balanced hand with a minimum of 20 HCP.
d) a strong three suiter with a minimum of 16 HCP.
e) an intermediate hand with 8+playing tricks in (an Acol two hand).
f) an intermediate hand with 8+playing tricks in (an Acol two hand).
3. Opening notrump bid at the two level or higher indicating at least 5-4 distribution in minors.
4. 2 artficial opening bid showing three suiter with short .
Responses and Rebids
1. 1 response to 1 opening bid is forcing one round, 1NT response to 1 opening bid to indicate at least four cards and 6+HCP.
2. An agreement where an ostensibly natural call may be made on two-card suits in some cases.
3. Two of a major response to one of a minor opening indicating at least 4-4 majors and less than game forcing value.
Competitive Bids
1. Transfer responses (Rubens advane, Rubensohl, Swich etc.).
LIST E (for Flight A games of: Prince Takamatu Cup, Minister of Education Cup (KO rounds), Asahi Shimbun Cup, Hyogo Governor's Cup, Kimura Rokuro Cup, Club league, OPEN IMP league)
Same as Category 2 of WBF System Policy.
LIST F (for Nihon League only)
Same as Category 1 of WBF System Policy.