Robot Bidding System (Precision)

1. Open Bid

Bid
 HCP
 Description
2NT
 22-23
 Balance hand, no 5 card major
1♣ 16+
 Open one of a suit and rebid no trumps at the lowest level
1♥/1♠ 11-15
 5 cards
1NT
 13-15
 Balance hand, no 5 card major
2♣ 11-15
 6+ cards or 5 cards with 4 card major
1♦ 11-15
 Usually 4 cards, at least 2+ cards
2♦ 11-15
 4-4-1-4 or 4-4-0-5 distribution, diamond at most 1 card, no 5card major
2♥/2♠ 8-10 Good 6 cards
3♣/3♦ 8-10
 Semi-solid 7 cards, has side entry, invite to 3NT
3♥/3♠ 8-10
 Good 7 cards, preemptive, 6 winning tricks for non-vul, 7 winning tricks for vul.
3NT
 ~10
 Solid 7 cards in minor, side card has little strength, gambling
4♣/4♦ 10-15
 Solid 8 cards in ♥/♠, or solid 7 cards in ♥/♠ with A or K in side card 
4♥/4♠ 8-10
 Preemptive, non-solid 8 cards

2. Response

1♣ opening and subsequent bids

Bid
 Description
1♦ 0-7 HCP, weak hand
1♥/1♠/2♣/2♦ 8+ HCP, 5+ cards
1NT
 8-10 HCP, balance hand, no 5 card major
2NT
 11-13 or 16+ HCP, balance hand, no 5 cards major
3NT
 14-15 HCP, balance hand, no 5 card major
2♥/2♠/3♣/3♦ 8+ HCP, 4-4-4-1 or 5-4-4-0, bid suit is shortage
3♥/3♠ 4-7 HCP, good 7 cards
4♥/4♠ 4-7 HCP, good 8 cards

1♣-X Intervention

Bid
 Description
Pass
 0-4 HCP
1♦ 5-7 HCP
X
 8+ HCP with 4-4 major

1♣ with intervention below 2NT

Bid
 Description
Pass
 0-4 HCP
New suit
 5-8 HCP, 5 cards
Jump new suit
 5-8 HCP, 6+ cards
1NT
 6-8 HCP, balanced hand, has stopper in opponent's suit
2NT
 9-11 HCP, balanced hand, has stopper in opponent's suit
3NT
 12-14 HCP, balanced hand, has stopper in opponent's suit
Cuebid
 9+ HCP, shortage in opponent's suit
X
 5+ HCP, takeout


1♦ opening and subsequent bids

Bid
 Description
Pass
 0-7 HCP, weak hand
1♥/1♠ 8-15 HCP, 4+ cards, force 1 round, search for 4 card major matching
Opener rebid (11-13 HCP) Opener rebid (14-15 HCP)
1♠: 4 cards.
2♣: 4+ cards, at least 5-4 in minor.
2♦: 6+ cards or good 5 cards.
1NT: else.		 Jump raise: 4+ card support.
Reverse (2♥/2♠): 4+ cards.
3♣: 4+ cards, at least 5-4 in minor.
3♦: 6+ cards or good 5 cards.
2NT: else.
1NT
 8-10 HCP, balance hand, no 4 card major
2♣/2♦ 11-15 HCP, 4+ cards, no 4 card major, force 1 round
3♦ 8-10 HCP, 5+ cards, preemptive
3NT
 13-15 HCP, balance hand, no 4 card major
Jump shift 16+ HCP, good 6+ cards or solid 5 cards, game forcing, slam interest
2NT
 16+ HCP, normally balance hand, game forcing

1♥/1♠ opening and subsequent bids

Bid
 Description
Pass
 0-7 HCP, weak hand
2♥/2♠ 8-10 HCP, 3+ cards support
Opener rebid
Pass: no game
Invitation: 14+ HCP, with good distribution
Trial Bid: 14+ HCP, 4+ cards (at least KXXX)
Jump game: to play
3♥/3♠ 11-13 HCP, 4+ cards or 3 cards (at least QXX) support, invitational
4♥/4♠ 8-10 HCP, 4+ cards, good distribution, sign off
3NT
 13-15 HCP, 4+ cards support, other suit no singleton or void, game forcing
Double jump shift
 Splinter, 11-15 HCP, 4+ card support, bid suit is shortage
1♠ 1-over-1, 8-15 HCP, 4+ cards, force 1 round
Opener rebid (11-13 HCP) Opener rebid (14-15 HCP)
2♠: 4+ cards
2♥: 6+ cards
2♣/2♦: 4+ cards
1NT: else
 3♠: 4+ cards
3♥: 6+ cards
3♣/3♦: 4+ cards
2NT: else
2♣/2♦/2♥ 2-orver-1, 11-15 HCP,  4+ cards if minor, 5+ cards if major, force 1 round
Opener rebid (11-13 HCP)
 Opener rebid (14-15 HCP)
Raise ♥: 3+ cards
New suit (level 2): 4+ cards
Rebid: else
 Jump Raise ♥: 3+ cards
Rebid: 6+ cards
New suit (reverse): 4+ cards
New suit (level 3 minor): 4+ cards
2NT: else
1NT
 8-15 HCP, not support for partner suit, no other suitable bid, force 1 round
Opener rebid (8-11 HCP)
 Opener rebid (12-15 HCP)
Rebid suit: 6+ cards
New suit: 4+ cards
Longer minor: else (2+ cards)
 Jump rebid: 6+ cards
Reverse (2♠): 4+ cards
Jump Shift: good 5+ cards
2NT: else
Jump shift
 16+ cards, good 6+ cards, game forcing
Opener rebid
(11-13 HCP or No compromised suit)
 Opener rebid
(14-15 HCP with compromised suit)
Raise major: 3+ or 2 with AKQ
Rebid: 6+ cards
NT: else
 Cuebid

2NT
 16+ cards, waiting, game forcing

1NT opening and subsequent bids

Bid
 Description
Pass
 0-9 HCP, balance hand
2♣ 8-11 HCP, Stayman, ask for 4 card major. If 8-11 HCP, with 5+ major or 6+ minor, use Stayman as relay.
2♦ 12+ HCP, Forcing Stayman, ask for 4 card major. If 12+ HCP, with use forcing Stayman as relay.
2♥/2♠ Under 7 HCP, 5+ cards, stop bid
3♣/3♦ Under 7 HCP, 6+ cards, stop bid
3♥/3♠ 11+ HCP, good 5+ cards, single suiter, game forcing
4♦/4♥ 11+ HCP, Texas transfer, request opener to bid 4♥/4♠
4♣ Gerber asking aces
2NT
 10-11 HCP, no 4 card major, invite to 3NT
3NT
 12-17 HCP, no 4 card major, sign off
4NT
 18-19 HCP, balance hand, invite to small slam
5NT
 22-23 HCP, balance hand, invite to grand slam
6NT
 20-21 HCP, balance hand, sign off
7NT
 24+ HCP, balance hand

2♣ opening and subsequent bids

Bid
 Description
Pass
 0-7 HCP, weak hand
2♦ 11+ HCP, ask for card shape
2♥/2♠ 8-10 HCP, 5+ cards
2NT
 10-11 HCP, balance hand, no 4 card major, invite to 3NT
3♣ 8-10 HCP, 4 or good 3 cards support, normally no 4 card major
Jump Shift
 14+ HCP, good 5+ cards
4♣ Under 7 HCP, 4+ cards support, preemptive

2♦ opening and subsequent bids

Bid
 Decription
Pass
 6+ diamond, no other support suit, little change of making game
2♥/2♠/3♣ Weak hand, sign off, may have only 3 cards support
3♥/3♠/4♣ 5-7 HCP, 4+ cards, game invitation
4♥/4♠/5♣ 5+ cards, good shape and strength to game, sign off
3NT
 Good diamond suit, has side suit entry, sign off
2NT
 8+ HCP, ask for details, game interest.

2♥/2♠ opening and subsequent bids

The bidding class shares the same handler with SAYC/ACOL

Bid
 Description
Pass
 Negative
Simple Raise
 Preemptive, stop bid
Double Raise
 Preemptive or game sign off
2NT
 13+ HCP, usually support opener's suit (2+ cards), ask for detail, force 1 round
Opener Rebid
  • Rebid opener suit: 6-8 HCP;
  • Jump new minor suit: 9-10 HCP, at least QXXXXX;
  • 3NT: 9-10 HCP, open suit at least AKQXXX;
  • New suit: 9-10 HCP, suit has honour, at least KX.
New Suit
 13+ HCP, good 5+ cards, ask for detail, force 1 round
Opener Rebid
  • Simple raise: 3+ cards or 2 with at least QX;
  • Rebid opener suit: 6-8 HCP;
  • Jump new minor suit: 9-10 HCP, at least QXXXXX;
  • 3NT: 9-10 HCP, open suit at least AKQXXX;
  • New suit: 9-10 HCP, suit has honour, at least KX.
3NT
 To play

2NT opening and subsequent bids

Bid
 Description
Pass
 0-3 HCP, balance hand
3♣ Stayman
3♦/3♥ Jacoby Transfer, 5+ cards, request partner to bid 3♥/3♠
3♠ Minor Transfer, require partner to bid 4♣ and make correction if necessary
4♣` Gerber asking aces
3NT
 4-9 HCP, balance hand
4NT
 10 HCP, balance hand, invitation to 6NT
5NT
 14 HCP, balance hand, invitation to 7NT
6NT
 11-13 HCP, balance hand, signoff
7NT
 15+ HCP, balance hand

3. Opener rebid

1♣-1♦

Bid
 Description
Limit
 16-21 HCP, 5+ cards or 4-4-4-1's 4 cards major
Jump
 22+ HCP, 5+ cards; with 9 winning tricks, 18+ HCP
Double jump
 22+ HCP, 4-4-4-1/4-4-5-0's shortage suit
1NT
 16-18 HCP, balance hand, may have 5 cards minor
2NT
 19-21 HCP, balance hand, may have 5 cards minor
3NT
 24-26 HCP. balance hand, may have 5 cards minor

1♣-1♥/1♠/2♣/2♦

Bid
 Description
Jump major game
 16 HCP, 4+ cards support, few control
Jump raise major
 17-19 HCP, 4+ cards support
Simple raise
 19+ HCP, usually 4+ cards support, ask trump control, slam interest
Control Reply (Control = AKQ)
+1: 5+ cards, no control
+2: 5 cards, 1 control
+3: 5 cards, 2 controls
+4: 6+ cards, 1 control
+5: 6+ cards, 2 controls
+6: 5+ cards, 3 controls
Shift
 16+ HCP, 5+ cards
Jump shift
 19+ HCP, Semi-solid 6+ cards, or 9+ winning tricks, slam interest
Double jump raise 17-19 HCP, Splinter, show shortage, 4+ cards support, slam interest
Simple NT
 16-18 HCP, balance hand, no 5 cards suit, usually has 2-3 cards on partner's suit
Jump NT
 19-21 HCP, balance hand, no 5 cards suit, usually has 2 cards on partner's suit
3NT
 16-18 HCP, shortage in partner's suit, no other better suit (only apply to 1♥/1♠ response

1♣-2♥/2♠/3♣/3♦

Bid
 Description
Jump to suit game
 16-18 HCP, 4+ cards (sometime good 3 cards)
2NT
 16-17 HCP, no support suit (applicable to 2♥/2♠)
3NT
 16-18 HCP, no support suit
Limit bid
 19+ HCP, 4+ cards, good shape, slam trial

1♣-3♥/3♠

Bid
 Description
Pass
 Lower bound, not support, no other better suit
Jump to game
 To play
New suit
 Slam interest, ask for control
Control Reply
+1:no control
+2: K or singleton
+3: A or void

1♣-4♥/4♠

Bid
 Description
Pass
 Lowe bound, not support, no other better suit
Blackwood
 Slam trial

1♣-1NT

Bid
 Description
2♦/2♥/2♠/3♣ 16+ HCP, 5+ cards, forcing
2♣ 16+ HCP, Stayman
2NT
 16 HCP, balance hand, deny 5+ cards, invite to 3NT
3NT
 17-21 HCP, balance hand, sign off
4NT
 24 HCP, balance hand, invite to 6NT
5NT
 27-28 HCP, balance hand, invite to 7NT
6NT
 25-26 HCP, balance hand, sign off
7NT
 29+ HCP
4♣ Gerber, ask Ace

1♣-2NT

Bid
 Description
3♦/3♥/3♠ 16+ HCP, 5+ cards, forcing
3♣ 16+ HCP, Stayman
3NT
 16-19 HCP, balance hand, sign off
4NT
 20-21 HCP, balance hand, invite to 6NT
5NT
 24-25 HCP, balance hand, invite to 7NT
7NT
 26+ HCP
4♣ Gerber, ask ace

1♣-3NT

Bid
 Description
Pass
 16 HCP, balance hand, sign off
4♣ 16+ HCP, Gerber, ask ace
4♦ 16 HCP, 5 cards club suit or diamond suit, slam trial
Responder Rebid
4♥: Club support
4♠: Diamond support
4NT: Nil
If both support, reply ace quantity as 4NT Blackwood
4♥/4♠ 16 HCP, 5 cards, sign off
4NT
 17-18 HCP, balance hand, invite to 6NT
6NT
 19-21 HCP, balance hand, sign off
7NT
 24+ HCP

2♣-2♦

Bid
 Description
2♥/2♠ 4 cards (heart/spade)
2NT
 6+ cards in clubs, has stopper in 2 outside suits
3♣ 6+ cards, has stopper in 1 outside suit
3♦ 5/6 cards in diamond/club
3NT
 6+ solid clubs, no 4 card major

4. Overcall

Overcalling their NT Openings

Cappelletti is adopted to defend against 1NT opening.

Bid
 Meaning
Double
 Shows an equivalent hand as 1NT open bid.
2♣ Unknown one suited hand,
2♦ Both major suits.
2♥ Heart and unnamed minor suit.
2♠ Spade and unnamed minor suit.
2NT
 Both minor suits
Overall
 Natural


Notes:

  1. Bidding other that those listed in the page may not be implemented for the robot.
  2. The page will be updated after robot has been modified and tested to be stable.
  3. The system is mainly based on the book《橋牌中級教程》copyrighted by 人民體育出版社. ISBN: 9787500907534.

Last modified at 21-Aug-2017 by WeWeWeb.