[straube]

How about?

1N-semiforcing
.....2m-natural
..........2H-weakness signal
...............2S-weak relay
....................P-wants to play 2S
....................2N-wants to play 2N
....................3m-light raise
..........2S-invitational, 2-fit
..........2N-invitational, misfit
..........3m-invitational raise
2C-GF relay or GI clubs
2D-constructive or limit raise
.....2H-invitational opposite a limit raise
2H-6H, less than GI
2S-weak raise

A problem here is redundancy with GI clubs. 1S-1N, 2C and responder shouldn't have a GI clubs. Maybe 1S-2C should be GF relay or GI 4+H

Let's see..

1S-2C
.....2D-bal, 4+C, 5440s
..........2S-4H/4C
..........2N-4H
.....2H-4+D
..........2N-4H
..........3D-4H/4D
.....2S-SS
.....2N-4H, higher or even short
.....3C-4H, lower short
.....etc-5/5H

[straube]

Tallied the results for 100 hands fitting a 1N through 2S reply and here are the frequency of responses....

1N-27

2C-20

2D-21 (CR or 3-cd LR)

2H-7

2S-25 (assuming NV, probably less V)

[straube]

So awm had a super-interesting idea for 1S-2D. Here's the latest...

2C-3-cd LR or GI 4-5 hearts (but not a 5/5) OR any GF relay. So relay breaks identify the 3-cd LR or GI heart hands.
.....2D-5332 or 5440 or 4+ clubs
..........2H-GF relay
..........2S-3-cd LR
..........2N-GI 4-5 hearts
...............3H-GF, 3 hearts
...............3S-GF, 6 spades
..........3m-GI 4H/6m
.....2H-4+ diamonds
..........2S-GF relay
..........2N-GI 4-5 hearts
...............3H-GF, 3 hearts
..............3S-GF, 6 spades
..........3C-GI 4H/6+C
..........3D-GI 4H/4+D
..........3S-LR
.....2S-SS
..........etc
.....2N-4H, higher or even shortness
.....3C-4H, lower shortness
.....etc-resolving 5S/5H

2D-Multi
.....2H-<3H (or maybe very minimum with 3H?)
..........P-6H minimum
..........2S-GI, 5H/5m
...............2N-asks minor
..........2N-GI, 5D/5C
..........3C-GI 6C
..........3D-GI 6D
..........3H-GI 6H
.....2S-3H

2H-constructive raise

2S-weak raise

This accomplishes a lot, including frequently getting to 2M when responder has a 3-cd limit raise (and when opener has a 5332).

This leaves 2N and higher open. Bergen raises? WJSs? Mini-splinters?

[straube]

2C-3-cd LR or GI 4-5 hearts (but not a 5/5) OR any GF relay. So relay breaks identify the 3-cd LR or GI heart hands.
.....2D-5332 or 5440 or 4+ clubs
..........2H-GF relay
..........2S-3-cd LR
..........2N-GI 4 hearts
..........3m-GI 4H/6m
.....2H-4+ diamonds
..........2S-GF relay
..........2N-GI 4 hearts
..........3C-GI 4H/6+C
..........3D-GI 4H/4+D
..........3S-LR
.....2S-SS
..........etc
.....2N-4H, higher or even shortness
.....3C-4H, lower shortness
.....etc-resolving 5S/5H

2D-5+H GI or 6+H light invite
.....2H-to play opposite 6+H light invite
..........P-light invite
..........2S-GI, 2S/5H
..........2N-GI, 0-1S/5H
..........3C-GI 5C
..........3D-GI 5D
..........3H-GI 6H
.....2S-6S, min (12-13)
.....2N-artificial GF
.....3m-5m, GF
.....3H-medium raise

2H-constructive raise

2S-weak raise

2N-LR, 4+ trump

3C-GI, 6 clubs

3D-MR

3H-constructive, 7 hearts

3S-weak raise

splinters


Tallied frequencies....

1N-24
2C-26
2D-4
2H-13
2S-18
2N-0
3C-2
3D-0
3H-2
3S-3
4D-1
4S-7

Still looking at the 2D Multi-use. This latest returned disappointing frequencies for 2D as hearts alone. OTOH it helps opener if he knows that responder has hearts immediately.

[straube]

Latest....

1N-semi-forcing
.....2C-4 clubs
..........2D-to play
..........2H-light raise of clubs
...............2S-six spades
..........2S-preference
..........2N-GI
..........3C-GI
.....2D-4 diamonds
..........2H-light raise of diamonds
..........etc
.....2H-4 hearts
..........3H-light raise of hearts (heavy invite would not respond 1N)
.....2S-6 spades


2C-3-cd LR or GI 4 heartsOR any GF relay . So relay breaks identify the 3-cd LR or GI heart hands.
.....2D-5332 or 5440 or 4+ clubs
..........2H-GF relay
..........2S-3-cd LR
..........2N-GI 4 hearts
..........3m-GI 4H/6m
.....2H-4+ diamonds
..........2S-GF relay
..........2N-GI 4 hearts
..........3C-GI 4H/6+C
..........3D-GI 4H/4+D
..........3S-LR
.....2S-SS
..........etc
.....2N-4H, higher or even shortness
.....3C-4H, lower shortness
.....etc-resolving 5S/5H

2D-6+H or 5+H GI
.....2H-to play opposite minimum with six hearts
..........P-minimum with six hearts
..........2S-GI, 2S/5H
..........2N-GI, 0-1S/5H
..........3C-GI 5C
..........3D-GI 5D
..........3H-GI 6H
.....2S-6S
..........P-minimum with six hearts
..........3H-GI 6H
.....2N-game try with 3+ hearts
.....3m-6m, max
.....3H-medium raise
.....3S-invite

2H-constructive raise

2S-weak raise

2N-LR, 4+ trump

3C-GI, 6 clubs

3D-mixed raise

3H-constructive, 7 hearts (this is to insure that 1S-2D, ?-3H is always GI)

3S-weak raise

splinters