[InTime]

What is the panel's feeling by playing System On after a take-out Double?
For instance 1NT still forcing, 1M - Dble - 2M still constructive etc.
If you feel uncomfortable using the above, you can just pass and come in later.
The Re-Double you can define to have a specific meaning whatever you prefer (example Rosenkranz after a major suit opening etc.)

Or,

Is it preferable to design a new system of responses after a take-out double?

I feel more comfortable to play System On after a take-out double because there are no impact on your responses. In other words just ignore the take-out double. In this instance there is probably less a chance of a misunderstanding afterwards.

The reason I am asking is because I have seen some world class players playing on BBO and running sometimes into difficulties not playing System On after a take-out double.

I will appreciate the feeling of the panel about this statement.
Also reasoning playing a certain way will also be appreciated.
Regards

[han]

System off.

[cherdano]

System on is horrible, you need to be able to bid your suits in competition.

[Codo]

System on has one advantage: You need less memory. This is a big advantage.
But the disadvantages are much bigger. Arend named the biggest: You should get your suits in non forcing asap.
So system off is it.

[P_Marlowe]

System off.

New suit at the 2 level are NF, even if you play a 2 over 1 after
a 1 level overcall as forcing.
They promised opening strength, so the frequence of non forcing
hans go up.

Quite a lot of expert players switch to transfer responses after a
t/o.

With kind regards
Marlowe

[Cascade]

Forcing No Trump is horrible without the double why would you want to use it after a double.

[Lobowolf]

It depends on the system. In partnerships where I play Bergen raises, I play them on over a double. If anything, I think the double improves their usefulness; responder is less likely to want to make a natural jump-shift (weak or strong) in a suit the doubler has ostensibly shown, and RHO is more likely to come in at a lower level.

[effervesce]

Transfers after the X are definitely preferable - it allows you to describe most hands better at the slight cost of not having a natural 1NT response

[dake50]

Agree effervesce, xfers allow me to show 'help' suit and delayed raise(xfer there, then support). Immediate 'good DT' raise(xfer to our suit). Weak distr raise(immediate raise/jump raise). 'Mixed' raise(X then support). AND start search if no fit.