Precision(Forum)

Default principles

Offensive bidding

Bidding diagrams

1♣				16+HCP
	1♦			0-7 HCP or three-suited
		1♥		16-21 Usually 5+ ♥s
			1♠
			1NT
			2♣
			2♦
			2♥
			2♠	Three-suited
			2NT	3-suited short in hearts
			3♣	Three-suited
			3♦	3-suited
		1♠		16-21 HCP. Usually 5+ ♠s
			1NT
			2♣
			2♦
			2♥
			2♠
			2NT	3-suited short in spades
			3♣	Three-suited
			3♦	3-suited
			3♥	Three-suited
		1NT		16-18
			2♣	Stayman
			2♦
			2♥
			2♠	Weak with either minor
			2NT
			3♣
			3♦
		2♣		16-21
			2♦
			2♥
			2♠
			2NT
			3♣
			3♦	Three-suited
			3♥	Thre-suited
			3♠	Three-suited
		2♦		16-21 HCP
		2♥
		2♠
		2NT		19-21
			3♣	Stayman
			3♦
			3♥
		3♣
		3♦
		3NT		24-27
	1♥
	1♠
	1NT			8-10 or 14-15
		2♣		Stayman
		2♦
		2♥
		2♠
	2♣
		2♦
	2♦
	2♥
	2♠
	2NT			11-13 or 16+
	3♣
	3♦

1♦				11-15 HCP, 4+ ♦ or 4135/1435
	1♥
		1♠
			1NT
			2♣	4th suit
			2♦
			2♥
			2♠	Usually four spades
			2NT
			3♣
			3♦	Usually four diamonds
			3♥
			3♠
		1NT
		2♣		♣ may be longer than ♦
			2♦
			2♥
			2♠	4th suit
			2NT
			3♣
			3♦	Usually four diamonds
			3♥
		2♦
			2♥
			2♠	Ostensibly natural, maybe NT probe, adv cue for ♦ or waiting
			2NT
			3♣	Onstensibly natural, maybe NT probe or adv cue for ♦
			3♦
			3♥
			4♦
		2♥
		2♠
		3♣
		3♦
			3♥
			3♠	Notrump probe or advanced cue
		3♥
	1♠
		1NT		1453-shape systematically possible
		2♣		♣ may be longer than ♦
		2♦
			2♥
			2♠
			2NT
			3♣	Can be a notrump probe or adv cue for ♦
			3♦
			3♥
			3♠
		2♥
		2♠
		3♣
		3♦
	1NT
	2♣
		2♦		Extra length and/or minimum hand
		2♥
		2♠
		2NT
		3♣
		3♦
	2♦
	2♥
	2♠
	2NT
	3♣
	3♦

1♥				11-15 HCP
	1♠
		1NT
			2♥
			2♠	Usually six spades
			2NT
			3♣
			3♦	Usually four diamonds
			3♥
			3♠
		2♣
			2♦	4th suit
			2♥	Possibly false preference
			2♠
			2NT
			3♣
			3♦
			3♥
			3♠
			4♣
		2♦
			2♥	Possibly false preference
			2♠
			2NT
			3♣	4th suit
			3♦
			3♥
			3♠
			4♦
		2♥
			2♠
			2NT
			3♣
			3♦	Usually four diamonds
			3♥
			3♠
		2♠
		3♣
			3♦	4th suit
		3♦
		3♥
		3♠
	1NT
		2♣
		2♦
		2♥
		2♠		No further agreements
		3♥
	2♣
		2♦
		2♥		Minimum and/or extra length
		2♠
		2NT
		3♣
		3♦
		3♥
	2♦
		2♥
		2♠
		2NT
		3♣
		3♦
		3♥
	2♥
	2♠
	2NT
	3♣
	3♦
	3♥
	3♠
	3NT
	4♣
	4♦
	4♥			In principle preemptive but can be quite strong

1♠				11-15 HCP
	1NT
	2♣
		2♦
			2♥	4th suit
		2♥
		2♠		Extra length and/or minimum
		2NT
		3♣
		3♦
		3♥
	2♦
		2♥
		2♠		Minimum and/or extra length
	2♥
		2♠		Minimum and/or extra length
		2NT
		3♣
		3♦
		3♥
	2♠
	2NT
	3♣			Either one-suited or fitbid
	3♦			Either one-suited or fitbid
	3♥			Either one-suited or fitbid
	3♠
	3NT
	4♣
	4♦

1NT		(12+)13-15 HCP
	2♣	Stayman
	2♦
	2♥
	2♠	Weak with either minor
	2NT
	3♣
	3♦

2♣				11-15 HCP, 6 ♣s or good five + 4M
	2♦
		2♥
			2♠	Ostensibly 5♠ but can be a notrump probe
			2NT
			3♣	Weaker than a direct raise (2NT)
			3♦	Ostensibly natural but can be a notrump probe
			3♥	Usually 4+
		2♠
			2NT
			3♣	Weaker than a direct raise (2NT)
			3♦	Ostensibly natural but can be a notrump probe
			3♥	Ostensibly 5♥ but can be a notrump probe
			3♠	Usually 4+
		2NT		6♣ likes to declare in notrump
			3♣
			3♦
			3♥
			3♠
		3♣		6♣ no maximum, likes partner to declare in notrumps
			3♦	Ostensibly natural but can be a notrump probe
			3♥
			3♠	Usually notrump probe
		3♦		6♣ maximum, likes partner to declare in notrumps
		3♥		6♣+4♥, maximum
		3♠		6♣+4♠, maximum
	2♥
	2♠
	2NT			Inv+ ♣ raise, stronger than via relay
	3♣
	3♦
	3♥
	3♠

2♦				11-15 HCP. 4414/4405 or 4315/3415 with weak ♣s
	2♥			Opener passes with 4 ♥s, otherwise rebids 2♠
	2♠
	2NT
		3♣		Minimum
		3♦		4414
			3♥
			3♠
			4♣
		3♥		3415 extras
		3♠		4315 extras
		3NT		4405 extras
	3♣
	3♥
	3♠

2♥

2♠

2NT		22-23
	3♣	Stayman
	3♦
	3♥

3NT									Gambling
	4♣								pass or correct

Disturbed bidding

Bidding diagrams

1♣					16+HCP
	(D)				Opps Bid
		Pass			Negative w/ 3- clubs. Or 3-suited positive, short in clubs
		RD			Negative w/ 4+ clubs. Or 3-suited positive, not short in clubs.
		1♦			0-7 HCP or three-suited
			1♥		16-21 Usually 5+ ♥s
				1♠
				1NT
				2♣
				2♦
				2♥
				2♠	Three-suited
				2NT	3-suited short in hearts
				3♣	Three-suited
				3♦	3-suited
			1♠		16-21 HCP. Usually 5+ ♠s
				1NT
				2♣
				2♦
				2♥
				2♠
				2NT	3-suited short in hearts
				3♣	Three-suited
				3♦	3-suited
				3♥	Three-suited
			1NT		16-18
				2♣	Stayman
				2♦
				2♥
				2♠	Weak with either minor
				2NT
				3♣
				3♦
			2♣		16-21
				2♦
				2♥
				2♠
				2NT
				3♣
				3♦	Three-suited
				3♥	Thre-suited
				3♠	Three-suited
			2♦		16-21 HCP
			2♥
			2♠
			2NT		19-21
				3♣	Stayman
				3♦
				3♥
			3♣
			3♦
			3NT		24-27
		1♥
		1♠
		1NT			8-10 or 14-15
			2♣		Stayman
			2♦
			2♥
			2♠
		2♣
			2♦
		2♦
		2♥
		2♠
		2NT			11-13 or 16+
		3♣
		3♦
	(1♦)				Opps Bid
		Pass			0-5 HCP or semipositive with ♦ (trap pass)
		D			Semipositive, any hand that can't penalize ♦, or t/o on ♦
		1♥
		1♠
		1NT			8-10 or 14-15
			2♣		Stayman
			2♦
			2♥
			2♠
		2♣
			2♦
		2♦
		2♥
		2♠
		2NT			11-13 or 16+
		3♣
		3♦
	(1♥)				Opps Bid
		Pass			0-5 HCP or semipositive with ♥ (trap pass)
		D			Semipositive, any hand that can't penalize ♥, or t/o on ♥
		1♠
		1NT			8-10 or 14-15
			2♣		Stayman
			2♦
			2♥
			2♠
		2♣
			2♦
		2♦
		2♥			5+ spades, 5+ minor
		2♠
		2NT			11-13 or 16+
		3♣
		3♦
	(1♠)				Opps Bid
		Pass			0-5 HCP or semipositive with ♠ (trap pass)
		D			Semipositive, any hand that can't penalize ♠, or t/o on ♠
		1NT			8-10 or 14-15
			2♣		Stayman
			2♦
			2♥
			2♠
		2♣
			2♦
		2♦
		2♥
		2♠			5+ hearts + 5+ minor
		2NT			11-13 or 16+
		3♣
		3♦
		3♥
	(1NT)				Opps Bid
		D			Semi-positive or penalty-oriented
		2♣
			2♦
		2♦
		2♥
		2♠
		2NT			5+/5+ minors
		3♣
		3♦
		3♥
		3♠
	(2♣)				Opps Bid
		Pass			0-5 HCP or semipositive with ♣ (trap pass)
		D			Semipositive, any hand that can't penalize ♣, or t/o on ♣
		2♦
		2♥
		2♠
		2NT			8-10 or 14+
		3♣			5-5 majors
		3♦
		3♥
		3♠
		3NT			11-13
	(2♦)				Opps Bid
		Pass			0-5 HCP or semipositive with ♦ (trap pass)
		D			Semipositive, any hand that can't penalize ♦, or t/o on ♦
		2♥
		2♠
		2NT			8-10 or 14+
		3♣
		3♦			5-5 majors
		3♥
		3♠
		3NT			11-13
	(2♥)				Opps Bid
		Pass			0-5 HCP or semipositive with ♥ (trap pass)
		D			Semipositive, any hand that can't penalize ♥, or t/o on ♥
		2♠
		2NT			8-10 or 14+
		3♣
		3♦
		3♥			5+ spades, 5+ minor
		3♠
		3NT			11-13
	(2♠)				Opps Bid
		Pass			0-5 HCP or semipositive with ♠ (trap pass)
		D			Semipositive, any hand that can't penalize ♠, or t/o on ♠
		2NT			8-10 or 14+
		3♣
		3♦
		3♥
		3♠
		3NT			11-13
	(3♣)				Opps Bid
		Pass			0-5 HCP or semipositive with ♣ (trap pass)
		D			Semipositive, any hand that can't penalize ♣, or t/o on ♣
		3♦
		3♥
		3♠
		3NT
	(3♦)				Opps Bid
		Pass			0-5 HCP or semipositive with ♦ (trap pass)
		D			Semipositive, any hand that can't penalize ♦, or t/o on ♦
		3♥
		3♠
		3NT
	(3♥)				Opps Bid
		D			Negative, asks primarily for heart guard (does not imply 4 spades)
		3♠
	(3♠)				Opps Bid
		D			Negative, asks primarily for spades guard (does not imply four hearts)
	1♦				0-7 HCP or three-suited
		1♥			16-21 Usually 5+ ♥s
			1♠
			1NT
			2♣
			2♦
			2♥
			2♠		Three-suited
			2NT		3-suited short in hearts
			3♣		Three-suited
			3♦		3-suited
		1♠			16-21 HCP. Usually 5+ ♠s
			1NT
			2♣
			2♦
			2♥
			2♠
			2NT		3-suited short in spades
			3♣		Three-suited
			3♦		3-suited
			3♥		Three-suited
		1NT			16-18
			2♣		Stayman
			2♦
			2♥
			2♠		Weak with either minor
			2NT
			3♣
			3♦
		2♣			16-21
			2♦
			2♥
			2♠
			2NT
			3♣
			3♦		Three-suited
			3♥		Thre-suited
			3♠		Three-suited
		2♦			16-21 HCP
		2♥
		2♠
		2NT			19-21
			3♣		Stayman
			3♦
			3♥
		3♣
		3♦
		3NT			24-27
	1♥
	1♠
	1NT				8-10 or 14-15
		2♣			Stayman
		2♦
		2♥
		2♠
	2♣
		2♦
	2♦
	2♥
	2♠
	2NT				11-13 or 16+
	3♣
	3♦

1♦				11-15 HCP, 4+ ♦ or 4135/1435
	(D)			Opps Bid
		RD		Penalty-oriented and/or ♣ and/or ♦
		1♥
		1♠
		1NT
		2♣
		2♦
		2♥
		2♠
		2NT
		3♣
		3♦
	(1♥)			Opps Bid
		D		4♠, possibly longer ♣ if < GF
		1♠
		1NT
		2♣
		2♦
		2NT
	(1♠)			Opps Bid
		D		4♥, possibly longer ♣ if < GF
		1NT
		2♣
		2♦
		2♥
		2NT
	(2♣)			Opps Bid
		D		both majors, possibly long ♠ if < GF
		2♦
		2♥
		2♠
		2NT
		3♣		♦ raise
	1♥
		1♠
			1NT
			2♣	4th suit
			2♦
			2♥
			2♠	Usually four spades
			2NT
			3♣
			3♦	Usually four diamonds
			3♥
			3♠
		1NT
		2♣		♣ may be longer than ♦
			2♦
			2♥
			2♠	4th suit
			2NT
			3♣
			3♦	Usually four diamonds
			3♥
		2♦
			2♥
			2♠	Ostensibly natural, maybe NT probe, adv cue for ♦ or waiting
			2NT
			3♣	Onstensibly natural, maybe NT probe or adv cue for ♦
			3♦
			3♥
			4♦
		2♥
		2♠
		3♣
		3♦
			3♥
			3♠	Notrump probe or advanced cue
		3♥
	1♠
		1NT		1453-shape systematically possible
		2♣		♣ may be longer than ♦
		2♦
			2♥
			2♠
			2NT
			3♣	Can be a notrump probe or adv cue for ♦
			3♦
			3♥
			3♠
		2♥
		2♠
		3♣
		3♦
	1NT
	2♣
		2♦		Extra length and/or minimum hand
		2♥
		2♠
		2NT
		3♣
		3♦
	2♦
	2♥
	2♠
	2NT
	3♣
	3♦

1♥				11-15 HCP
	1♠
		1NT
			2♥
			2♠	Usually six spades
			2NT
			3♣
			3♦	Usually four diamonds
			3♥
			3♠
		2♣
			2♦	4th suit
			2♥	Possibly false preference
			2♠
			2NT
			3♣
			3♦
			3♥
			3♠
			4♣
		2♦
			2♥	Possibly false preference
			2♠
			2NT
			3♣	4th suit
			3♦
			3♥
			3♠
			4♦
		2♥
			2♠
			2NT
			3♣
			3♦	Usually four diamonds
			3♥
			3♠
		2♠
		3♣
			3♦	4th suit
		3♦
		3♥
		3♠
	1NT
		2♣
		2♦
		2♥
		2♠		No further agreements
		3♥
	2♣
		2♦
		2♥		Minimum and/or extra length
		2♠
		2NT
		3♣
		3♦
		3♥
	2♦
		2♥
		2♠
		2NT
		3♣
		3♦
		3♥
	2♥
	2♠
	2NT
	3♣
	3♦
	3♥
	3♠
	3NT
	4♣
	4♦
	4♥			In principle preemptive but can be quite strong

1♠				11-15 HCP
	1NT
	2♣
		2♦
			2♥	4th suit
		2♥
		2♠		Extra length and/or minimum
		2NT
		3♣
		3♦
		3♥
	2♦
		2♥
		2♠		Minimum and/or extra length
	2♥
		2♠		Minimum and/or extra length
		2NT
		3♣
		3♦
		3♥
	2♠
	2NT
	3♣			Either one-suited or fitbid
	3♦			Either one-suited or fitbid
	3♥			Either one-suited or fitbid
	3♠
	3NT
	4♣
	4♦

1NT						(12+)13-15 HCP
	(D)					Opps Bid
		RD				Weak two-suiter
			2♣
				2♦		♦ and a major
					2♥	Pass or correct
				2♥		Majors
			2♦			Doubleton clubs or 3343
		2♣
		2♦
		2♥
		2♠
	2♣					Stayman
	2♦
	2♥
	2♠					Weak with either minor
	2NT
	3♣
	3♦

2♣				11-15 HCP, 6 ♣s or good five + 4M
	(2♦)			Opps Bid
		D		Negative
		2♥
		2♠
		2NT
		3♣
	(2♥)			Opps Bid
		D		Negative
		2♠
		2NT
		3♣
		3♦
	(2♠)			Opps Bid
		D		Negative
		2NT
		3♣
		3♦
		3♥
	2♦
		2♥
			2♠	Ostensibly 5♠ but can be a notrump probe
			2NT
			3♣	Weaker than a direct raise (2NT)
			3♦	Ostensibly natural but can be a notrump probe
			3♥	Usually 4+
		2♠
			2NT
			3♣	Weaker than a direct raise (2NT)
			3♦	Ostensibly natural but can be a notrump probe
			3♥	Ostensibly 5♥ but can be a notrump probe
			3♠	Usually 4+
		2NT		6♣ likes to declare in notrump
			3♣
			3♦
			3♥
			3♠
		3♣		6♣ no maximum, likes partner to declare in notrumps
			3♦	Ostensibly natural but can be a notrump probe
			3♥
			3♠	Usually notrump probe
		3♦		6♣ maximum, likes partner to declare in notrumps
		3♥		6♣+4♥, maximum
		3♠		6♣+4♠, maximum
	2♥
	2♠
	2NT			Inv+ ♣ raise, stronger than via relay
	3♣
	3♦
	3♥
	3♠

2♦				11-15 HCP. 4414/4405 or 4315/3415 with weak ♣s
	(D)			Opps Bid
		Pass		Diamonds, opener must pass
		RD		Both majors (3+ 3+), no preference, or GF
		2♥
	(2♥)			Opps Bid
		D		Penalty
	(2♠)			Opps Bid
		D		Penalty
	(3♣)			Opps Bid
		D		Penalty
		3♦
	2♥			Opener passes with 4 ♥s, otherwise rebids 2♠
	2♠
	2NT
		3♣		Minimum
		3♦		4414
			3♥
			3♠
			4♣
		3♥		3415 extras
		3♠		4315 extras
		3NT		4405 extras
	3♣
	3♥
	3♠

2♥

2♠

2NT		22-23
	3♣	Stayman
	3♦
	3♥

3NT									Gambling
	4♣								pass or correct

Defensive bidding

Bidding diagrams

Udspil