[bali 2]

W opens 2NT, but N believes 1NT and overcalls 2H
2H is by system showing 5 Hearts and 5 cards in an unspecified minor. Is it considered as an artificial Call or not ?

Many thanks in advance
Al. Ohana

[duschek]

Definitions said:

Artificial call — is a bid, double, or redouble that conveys information (not being information taken for granted by players generally) other than willingness to play in the denomination named or last named; or a pass which promises more than a specified amount of strength or if it promises or denies values other than in the last suit named.

Basically, all bids which do not show the suit or which show other suits, even if unspecified, are artificial. So is (1NT)-2♥ showing hearts and a minor.

[CamHenry]

It's worth noting that this does not automatically prevent a correction. If, as we do, you play the same basic defence to 2NT as you do to 1NT, 3H is likely to be a legal correction. The UI is that you'd overcall over 1NT as well as over 2NT (if you make the correction), but the hands that we'd use to overcall 2NT are a subset of those you'd overcall 1NT.

Of course, if 3H means something different here, it's not a legal correction.

[helene_t]

Yes, for the purpose if score correction this 2♥ bid is artificial.

Note that the 2007 laws are different from the old laws. As CamHenry says, it is now allowed to substitute 2♥ with 3♥ if all or almost all hands that would bid
(2NT)-3♥
would also bid
(1NT)-2♥

Suppose the 2♥-bidder did not have any defense against 2NT on his CC. It would then be convenient for this partnership if one could assume that the same defense applies as against 1NT. Can we? I don't think I would allow the bid to be substituted, unless there was evidence that they actually do play the same defense against 2NT.