[foobar]

My recollection is that for non-GCC events, IMPrecision used to have 1♦ - 2N as either 13-16 balanced GF (asking for shortness) OR weak 3m.

• How does this mesh with the new ACBL charts?
  
• What type of hands would make this response (as opposed to responding 2m, which is also forcing)? Also, is the intent to be able to stop in 4m opposite shortness and no stopper?

[awm]

It's been a while, but my recollection was that there were a couple reasons to play this:

1. We wanted a bid for "weak with both minors" and this method let us play 1♦-3♣ that way while still having a "weak with clubs" bid.
2. The direct 2m response might wrong-side 3nt (since opener rebids 2nt over this sometimes), so it's nice to be able to right-side it by bidding NT directly without going all the way to 3NT (which opener can basically never bid over, even though when he has shortness you might be better off in 5m or 6m).

With this said, we dropped this a long time back, only partially because of the convention charts. The wrong-siding concern is pretty rare and we haven't found that we lose much in practice by bidding 2m.

[mycroft]

No idea about 2 (but the GF here is "not a diamond raise", which is different from 2♦), but to 1, as expected: not legal Basic/+, legal as long as you never psych it Open/+.

*All* responses are legal Open/+ unless they're "checking for a psychic opener" or "artificial, below 2NT, and a psych is possible."

[foobar]

 awm, on 2025-April-26, 10:31, said:

With this said, we dropped this a long time back, only partially because of the convention charts. The wrong-siding concern is pretty rare and we haven't found that we lose much in practice by bidding 2m.

What is the 2N response in the latest incarnation?

[awm]

foobar, on 2025-April-26, 11:13, said:

What is the 2N response in the latest incarnation?

I guess another advantage was that if 2nt is purely a weak bid, opponents have more options available, whereas if it can be strong then a direct action becomes quite risky.

In the current iteration of the notes, 2nt is just weak both minors. It doesn't come up much.