[steve2005]

1♣ -(1♦)

This is the most advantageous use of transfers as hard to get 4-4 in majors to make perfect double so often double made on 4-3. Also, if your used to transfer Walsh you can use those continuations.

double=4+hearts
1♥=4+spades
1♠=good club raise
2♣=normal club raise

I've looked at other possible auctions and it seems you have to give up to much to use transfers. For example 1♦-(1♠) do you give up useful takeout double or natural1N to start transfers. One other possibility is to start transfers at 2♣ but then to show clubs your doing it a 3-level. Another possibility is to start transfers at 2N which is less useful as a natural bid. This is workable but because of the level doesn't take full advantage of transfers.

Remember, answers must conform to ACBL GCC which states allowed:, "TRANSFER RESPONSES (responses after overcalls) where the call shows length or values in the suit of the transfer."

I'm looking to see if anyone has useful methods with transfers after overcalls in other bidding sequences.

[suokko]

Ambra [1] has transfers to most of overcall situation with many places having transfers in two different levels.

1m(1♠) is definitely annoying trade off.

* Giving up take out double isn't possible
* I prefer not to give up natural mild invite 1NT

Losing 2 level clubs bid is actually workable if you compare to 2 clubs being forcing. Too bad we ended up losing competitive+ 5+5+ cue bid also to allow competitive club bids and mixed raise for ♦.

1[♦ (1♠)
X 4(5)♥
1NT mild invite (7)8-10
2♣ inv+ 4+♦
2♦ 7+ 5+♥
2♥ stopper asking, either BAL inv+ or inv ♣ no stopper
2♠ competitive or FG no stopper 5+♣
2NT inv+ ♣ promises stopper,
3♣ mixed raise
3♦ preemptive
3♥ inv 6+♥
3♠ splinter
3NT S/O
4♣ FG 5+♥5+♣
4♦ preemptive or preemptive invite depending on zones.

EDIT: I forgot to mention that this structure is used in system where 1♦ is always unbalanced. That makes it likely that raise structure might require some modifications like 2♣ promising only constructive values.

[1] Daniel's system page has link to Ambra documentation http://www.bridgewithdan.com/systems/

[Gerben42]

Not sure if Dbl is considered an overcall but we play:

1♥ (Dbl)

1NT = ♣
2♣ = ♦
2♦ = good raise
2♥ = bad raise

1♠ (Dbl)

1NT = ♣
2♣ = ♦
2♦ = ♥
2♥ = good raise
2♠ = bad raise

[Gerben42]

Transfers after 1m opening and minor overcall:

* 2 red is transfer to major
* transfer to partner suit is 5-5 majors forcing

1♣ (1♦) ?

2♣: forcing raise (inverted minors)
2♦: 6+♥, weak or strong
2♥: 6+♠, weak or strong
2♠: 5 - 5 majors invite or better

1♦(2♣) ?

2♦: ♥, either non-forcing freebid or forcing freebid
2♥: ♠, either non-forcing freebid or forcing freebid
2♠: forcing raise (inv. minors)
3♣: 5 - 5 majors invite or better

****

after major overcall, transfers start at the single raise

* Transfer to opponent's suit shows the forcing raise
* Transfer to 2NT shows 5 - 5 in remaining suits, forcing

1♣ (1♥) ?

2♣: ♦
2♦: forcing raise
2♥: 6+♠, weak or GF
2♠: 5 - 5 in remaining suits, forcing

[paulg]

Gerben42, on 2015-May-17, 16:30, said:

Not sure if Dbl is considered an overcall but we play:

You may play any continuations after a non-penalty double under GCC in ACBL.

[steve2005]

paulg, on 2015-May-18, 01:13, said:

You may play any continuations after a non-penalty double under GCC in ACBL.

Yes.as it is a convention and your allowed any defense to a convention.

[SteelWheel]

-

[fromageGB]

Certainly transfers after a 1♣ is overcalled fits well with transfer walsh if that is your normal method, and I like transfers after an overcall of our 1♥ or 1♠ opening, starting with X, and up to 2M. 2M directly is a weak raise, and transfer to 2M is a full-bloodied raise to 2M (whatever that means in your methods). 1♥ (1♠) X = transfer to NT (can raise later).

I find the transfer double more useful than hoping for opener to have 4 in the other major when he has already shown 5 in his, which is quite rare.