Blueberry Precision Club is a modernized Precision Club mixing new ideas from BTU. It is a 5-card major strong club system. It is highly experimental and subject to change without notice.

Shared methods

Looking for a chapter that is missing here? These methods are covered in Strawberry Polish Club:

1♥ and 1♠: Polish 11–16 variants are just one point higher than our 10–15.
1NT and its continuations: adjust strength requirements from 15–17 to our 13–15.
Multi 2♦
Muiderberg 2♠
Unusual 2NT
BTU Namyats

See Openings for Blueberry’s opening meanings and ranges.

Notation

This book follows Strawberry Polish Club for hand evaluation, bidding notation, and punctuation in tables and prose.

References

General methods

Jan Eric Larsson. Good, Better, Best: A comparison of bridge bidding systems and conventions by computer simulation. ISBN 978-1771402415
Thomas Andrews. Thomas’s Bridge Fantasia
Bridge Base. GIB Bid Descriptions

Precision Club

Daniel Neill. Standard Modern Precision: Getting from Here to There. ISBN 978-1771401791
Edward Piwowar. PC - Meckwell Lite Precision Club

Other strong clubs

Arturo Franco, Marco Pancotti, and Daniel J. Neill. Blue Team Club
Jan Eric Larsson, Anu Uus, and George Wang. Kaninklöver / Cottontail Club: A Cheatsheet (2022)
Bo-Yin Yang. Terrorist’s Moscito, or Major-Oriented Strong Club, with Interpid Two Openers

Openings


1♣!	STR ART, 16+
1♦!	NF, 10–15, 0+♦
1♥	10–15, 5+♥
1♠	10–15, 5+♠
1NT	13–15, 2–5♠, 2–5♥, 2–6♦, 2–6♣
2♣	10–15, 6+♣
2♦!	PRE, 3–9, 6+♠♥
2♥!	PRE, 3–9, 4–5♠, 4–5♥
2♠!	PRE, 3–9, 5=♠, 4+♦♣
2NT!	UNT, 3–9, 5+♦, 5+♣
3X	PRE, 7+#
3NT!	Gambling, SOL 7+♦♣, 0–1 outside A/K
4♣!	PRE, S-SOL 8+♠♥, 0–1 outside A/K
4♦!	PRE, SOL 8+♠♥, no outside A/K
4M	PRE, 8+#
4NT!	UNT, 6+♦, 6+♣

The notrump ladder

11–12: 1♦♥♠
13–15: 1NT
16–18: 1♣ - 1♦ - 1NT
19–21: 1♣ - 1♦ - 1♥
22–24: 1♣ - 1♦ - 2NT
Game-forcing: 1♣ - 1♦ - 1♥

Strong 1♣

Blueberry employs an approach similar to Viking Precision 2007. However, I frown at extensive transfers. It would be annoying to declare the phoney strain the strong opener actually holds.

1♣ -
1♦!	ART NEG, 0–7
1♥!	FG: 5+♥ or BAL 13+
1♠	FG, 5+♠
1NT	BAL FG, 8–12
2♣♦	UNBAL FG, 5+#
2♥!	FG, 5+ 4+ minors
2♠!	FG, 8–12, (4441)
2NT!	S/T, 13+, (4441)
3♣!	FG, SOL 7+ suit
3♦♥♠	FG, S-SOL 7+#
3NT!	FG, S-SOL 7+♣
4♣!	PRE, S-SOL 7+♠♥, 0–1 outside A/K
4♦!	PRE, SOL 7+♠♥, no outside A/K
4♥♠	PRE, 7+#

Negative 1♦

Relay structure from Viking Precision 2007 nest very strong hands into 1♣ - 1♦ - 1♥. This treatment rescues the 2NT opening from the notrump ladder and frees 2NT up for preemptive uses.

1♣ - 1♦ -
1♥!	ART F, 19+
1♠	16–19, UNBAL 4+♠
1NT	16–18, BAL
2♣♦♥	16–19, UNBAL 5+#
2♠!	16–19, 4+♥, 6+♦♣
2NT!	16–19, 5♥(440)
3♣♦!	16–19, 5+#, 5+♥
3♥!	16–19, 6+♥, 4+♠
3♠	16–19, 7+♠

1♣ - 1♦ - 2♠ -
2NT!	Ask for the minor suit
3♣!	P/C
3♦!	INV+, 4+♥

Strong 1♥

1♣ - 1♦ - 1♥ -
1♠!	DBL NEG, 0–4
1NT	BAL FG, 2–4♠, 2–4♥, 2–5♦, 2–5♣
2♣♦	UNBAL FG, 5+#
2♥♠	FG, 5–6#
2NT!	FG, (4441)
3♣!	FG, 5+♦, 5+♣
3♦!	FG, 5+♠, 5+♥
3♥♠	FG, 7+#

1♣ - 1♦ - 1♥ - 1♠ -
1NT	BAL 19–21
2♣!	20–23, 2+♣
2♦	20–23, (5+♦ or 4♦(441))
2♥♠	20–23, 5+#
2NT	NAT FG

1♣ - 1♦ - 1♥ - 1NT -
2♣!	STAY

Kokish 1♥

1♣ - 1♥ -
1♠!	(R)
1♠ - 1NT	BAL 13+
1♠ - 2♣♦♠	4+#, 5+♥
1♠ - 2♥	6+♥
1♠ - 2NT	BAL 8–12, 5=♥

Positive minor suits

1♣ - 2♣ -
2♦!	(R)
2♥♠	5+#
2NT!	6+♦
3♣	3+♣
3♦!	16–18, 5+♦, 5+♥
3♥!	16–18, 5+♥, 5+♠
3♠!	16–18, 5+♠, 5+♦

1♣ - 2♦ -
2♥!	(R)
2♠	5+♠
2NT!	5+♥
3♣	5+♣
3♦	3+♦
3♥!	16–18, 5+♥, 5+♣
3♠!	16–18, 5+♠, 5+♣
3NT!	16–18, 5+♠, 5+♥

Catchall 1♦

1♦ -
1♥♠	F, 4+#
1NT	NAT NF
2♣	INV+, 4+♣
2♦!	LIM+, 4+♦
2♥!	PRE P/C, 4–5♥, 5=♠
2♠!	INV P/C, 5–6♠, 4=♥
2NT	NAT INV, 11–12
3♣♦!	PRE, 0–7, 6+#
3♥♠!	PRE, 0–7, 7+#

Wilkosz defense

Caution

Wilkosz is originally an opening. Its brown sticker status carries over to this overcall if over a natural opening. This defense is legal only when any of these holds:

The event permits brown sticker methods, or

Our 1♦ opening is classified as artificial.

The latter is contested. See my research notes on possibly-void Precision 1♦ precedents.

I still suggest Wilkosz 2♦ even though I regard our 1♦ opening as natural. Wilkosz covers 5 of the 6 possible two suiters. I prefer it against nebulous minor suit openings, but it calls for the legal precautions above.

(1♦)	0+♦
2♦!	Wilkosz, 5+♠♥, 5+ another suit
2NT!	UNT, 5+♦, 5+♣

(1♦) 2♦ -
2♥♠!, 3♣!	P/C
2NT!	(R) FG
3♦!	INV+, 2+♠, 2+♥
3♥♠!	PRE P/C
3NT, 4♥♠	NAT
4♣!	STR COG
4♦!	PRE COG

(1♦) 2♦ - 2NT -
3♣	5+♣, 5+♠♥
3♣ - 3♦	Ask for the major suit
3♦	5+♦, 5+♥
3♥	5+♥, 5+♠
3♠	5+♠, 5+♦

There are two kinds of choice of games:

4♣ by strength
4♦ by distribution

Such distinction helps judging how to react to interference. Besides, 4♣ lets the strong hand declare. On the other hand, 4♦ closes the auction ASAP.

(1♦) 2♦ - 4♣ -
4♦!	TRF, 5+♥
4♥!	TRF, 5+♠

Precision 2♣

2♣ -
2♦!	(R) F2NT
2M	NF, 5+#
2NT!	LEB: (PRE, 3+♣) or (FG, 5+ 5+ non-♣)
3♣	LIM, 3+♣
3X	INV, 6+#
4♣	PRE, usually 4+♣

The 2♦ relay

2♣ - 2♦ -
2♥!	0–2♥ or 4+♠
2♠!	0–2♠ or 4+♥
2NT!	MIN, 3+♠, 3+♥, 0–1♦
3♣!	BAL MAX, ♠Hx(x)+, ♥Hx(x)+
3♦!	MAX, 0–1♦
3♥!	BAL MAX, ♠xxx
3♠!	BAL MAX, ♥xxx, ♠Hx+
3NT!	BAL MAX, ♥xxx, ♠Hxx+

The 2NT puppet

2♣ - 2NT - 3♣ -
P	PRE, 3+♣
3♦!	FG, 5+♦, 5+♥
3♥!	FG, 5+♥, 5+♠
3♠!	FG, 5+♠, 5+♦

Competing at the 2-level

2♣ (X)
XX	PEN, BAL INV+, 2–3♣
2♦	(R): STAY or FG
2M	NF, 5+#
2NT!	LEB: (PRE, 3+♣) or (FG, 5+ 5+ non-♣)
3♣	LIM, 3+♣
3X	INV, 6+#

2♣ (2X)
X!	T/O: STAY or FG
2M	NF, 5+#
2NT!	LEB: (PRE, 3+♣) or (FG, 5+ 5+ non-♣)
3♣	LIM, 3+♣

2♣ (2♦)
3♦!	INV+, 6+♥
3♥!	INV+, 6+♠
3♠!	FG, ask for stopper

2♣ (2♥)
3♦	INV, 6+♦
3♥!	INV+, 6+♠
3♠!	FG, ask for stopper

2♣ (2♠)
3♦♥	INV, 6+#
3♠!	FG, 6+♥

Lyric 2♥

The related 2♦={both majors} opening is known as Ekren or Ekrens after the Norwegian grand master who invented it. Bjørn Olaf Ekren prefers the 2♦ incarnation should not bear his name.

—Bridge: 2♥ as weak in both majors, Chris Ryall

I prefer BTU Terrorist’s continuations.

2♥ -
2NT	NAT INV
3♣!	INV+, 3+♠
3♦!	INV+, 3+♥
3NT	S/O
4♣♦	NAT S/T

2♥ - 3♣ -
3♦!	MIN, 4=♠
3♥	MAX, 5+♥
3♠	MIN, 5+♠
3NT	MAX, 44(xx)
4♣+	MAX, 5+♠

2♥ - 3♦ -
3♥	MIN
3♠!	MAX, 4=♥
3NT+	MAX, 5+♥

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Blueberry Precision Club