1§-1¨-1©-1ª = not game force
1§-1¨-1©-2ª = game force with ♠
Other 4th suit auctions forcing to game
1¨
-1©
-1ª
-3§
= to play weak 4-6 (see special 4th suit auctions)
1©
- 1ª
- 2§
- 3♦ = weak 4-6 (see special 4th suit auctions)
1§
-1©-1ª -3¨ =
forcing
2 special 4th suit auctions
1© - 1ª - 2§ - 2© = 4th
suit game forcing (not slammish in majors)
1©
- 1ª
- 2§
- 2¨
= puppet to 2© (starts all invitational sequences) then
2♠ = 6 card suit HCP to accept
3NT
2NT = natural 5 card ♠ suit
3♣ = natural
3♦ = natural
3♥ = playable only in ♥
3♠ = playable only in ♠
1©
- 1ª
- 2§
- 2NT invitational no 5 card ♠ suit
1©
- 1ª
- 2§
- 3♣ = courtesy
raise
1©
- 1ª
- 2§
- 3♦ = weak 4-6
1©
- 1ª
- 2§
- 3♥
= slammish
1©
- 1ª
- 2§
- 3♠
= slammish
1¨ - 1© - 1ª - 2¨= 4th
suit game forcing (not slammish except in ♣)
1¨
- 1©
- 1ª
- 2§ = puppet
to 2¨ starting all invitational
sequences
2♥ = invite with 6 card suit
with HCP to accept 3NT
2♠ = natural with HCP to
accept 3NT
2NT
(invitational with 5 card ♥ suit)
3♣ = natural
3♦ =
natural
3♥ = playable only
in ♥
3♠ = playable only
in ♠
1¨
- 1©
- 1ª
- 2NT (invitational no 5 card ♥ suit)
1¨
- 1©
-1ª
-3§
= to play weak 4-6
1¨
- 1©
- 1ª
- 3♦, = slammish
1¨
- 1©
- 1ª
- 3♥ = slammish
1¨
- 1©
- 1ª
- 3♠ = slammish