This part shares similarities with the 1♣ opening .
There are also differences because 1♦ shows a long suit that allows further
preempts.
Notrump transfers to clubs as its natural meaning is not very useful.
Unlike 1♣ (X), there is no space for Transfer Walsh here.
Reuse 1♦ (X) 2♣ for Flannery because the rebidding problem persists.
1♦ (X)
XX NF BAL G/T , 10+1M F , 7+, 4+#1NT! TRF , 7+, 5+♣ 2♣ ! ART , 5–11, 5+♠ , 4+♥ 2♦ PRE , 0–7, 4+♦ 2M PRE , 0–7, 6+#2NT! TRF , (PRE , 7+♣ ) or (FG , 6+♣ )3♣ ! INV + TRF , 4+♦ 3♦ CONST , 8–10, 4+♦ 3M PRE , 7+#
1♦ (1♥ )
X! TRF , 7+, 4+♠ 1♠ ! TRF to 1NT, 8+1NT NAT , 8–102♣ F , 10+, 5+♣ 2♦ CONST , 6–9, 4+♦ 2♥ ! TRF , 6+♠ 2♠ ! INV +, 10+, 4+♦ 2NT NAT INV , 10–113♣ PRE , 7+♣ 3♦ PRE , 0–6, 4+♦ 3♥ ! TRF , (PRE , 7+♠ ) or (FG , 6+♠ )3♠ ! Gambling, SOL 7+♣ without stopper
1♦ (1♠ )
X! NEG , 7+, 4–5♥ or BAL FG 1NT NAT , 8–102♣ F , 10+, 5+♣ 2♦ ! TRF , 10+, 5+♥ 2♥ NF , usually 6+♥ 2♠ ! CONST +, 8+, 4+♦ 2NT NAT INV , 10–113♣ ♥ PRE , 7+#3♦ PRE , 0–7, 4+♦ 3♠ ! Gambling, SOL 7+♣ without stopper
Bidding against 1♣ ♦ (1NT) is analogous to a weak notrump. The agreement to
borrow Landy 2♣ here is also called Landik.
1♦ (1NT)
X PEN , INV +2♣ ! UNBAL , 4+♠ , 4+♥ 2NT! UNBAL FG
After 2♣ , advance as in the Landy defense to 1NT .
With clubs directly below diamonds, bidding after 1♦ (2♣ ) is pretty natural.
1♦ (2♣ )
X! T/O , INV +2♦ PRE , 4+♦ 2M NF , 5+#2NT NAT INV 3♣ ! INV +, 4+♦ 3♦ CONST , 4+♦ 3M FG , usually 6+#
BTU vs Unusual handles 1♦ (2♦ ) well. The third cuebid 2NT shows tolerance in
both minors.
1♦ (2♦ ) Both majors
X PEN for either major2♥ ! FG +, 5+♣ 2♠ ! INV +, 4+♦ 2NT! INV +, 3+♦ , 4+♣ 3♥ ♠ ! Ask for stopper
Rubinsohl follows 1♦ (2M). The forcing raise 3♣ and the preemptive raise 3♦
put immediate pressure on the opponents with the diamond fit. FunBridge also
inspired the Strawberry add-on of 3♥ ♠ .
1♦ (2M)
X! OPT , INV +2♠ NF , 5+♠ 2NT! TRF , 5+♣ 3♣ ! INV +, 4+♦ 3♦ NF , 4+♦ 3♥ ! FG , 5=OM3♥ - 3♠ ! Ask for stopper 3♠ ! FG , 6+OM
Screenshot from
FunBridge game engine specifications (requires login)
