[michel444]

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west is Dealer
your biding system is a 5 cards Major
North open 1♦
East pass
what do you bid
if east make a 1♥ over call does it change ?

[Cyberyeti]

South opens 1♦ and you give us the South hand, this doesn't help. If you mean N opens 1♦ I respond 2♦ inv + inverted. If there's a 1♥ overcall I can (unusually, most people don't do this) still use the invert or bid 2N natural. 2♥ would be available to most people as a diamond raise.

[pescetom]

What is a boring hand doing in Interesting Bridge Hands?

As Cyberyeti said, it depends upon many system variations, there is no single "5 card majors". To start with, 1♦ might promise 3,4 or even 5 cards. Most could bid a natural 2NT response, although that would be timid here IMO. Some play 1♦ - 2♦ as GF, others 1♦ - 2♣, others both of these or neither.
In our system it would probably go 2♣ if uncontested, 2NT if E interferes 1♥ though a 2♥ diamond raise is also available.

[michel444]

Cyberyeti, on 2022-September-13, 02:08, said:

South opens 1♦ and you give us the South hand, this doesn't help. If you mean N opens 1♦ I respond 2♦ inv + inverted. If there's a 1♥ overcall I can (unusually, most people don't do this) still use the invert or bid 2N natural. 2♥ would be available to most people as a diamond raise.

thank you !
I edited post
If we don't do mistake we don't learn.

[mycroft]

In the ACBL you will likely see many people bid 2NT with this hand. They either don't have enough points (GF) or enough diamonds (5) for a diamond raise, and this hand is balanced. I'm not saying that's good, but it would happen.

1♦-2NT INV NF is incredibly ugly, but it seems to be becoming standard.

I doubt it would change with a 1♥ overcall, but many (including me) would shift to "support with support in competition", 4-cards and no ruffing value ignored.

If you play "unbalanced diamond" or at least "1♣ clubs or balanced", that tips the scales in favour of a diamond raise; at least you don't have 12-flat opposite 12-flat pretending to play in diamonds.

[michel444]

michel444, on 2022-September-13, 01:16, said:

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west is Dealer
your biding system is a 5 cards Major
North open 1♦
East pass
what do you bid
if east make a 1♥ over call does it change ?

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6 diamond is makebale if finess work
yje final contract is 3Nt making 6

[Gilithin]

michel444, on 2022-September-13, 12:48, said:

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6 diamond is makeable if finesse work
the final contract is 3NT making 6

North "opened" with a Forcing Pass and didn't alert it?

[michel444]

Gilithin, on 2022-September-13, 16:08, said:

North "opened" with a Forcing Pass and didn't alert it?

FP is ilegal under ACBL regulation this was a simulation not a game in a Club !!!
half of the biding sequence is missing and i enter every bid of the process

[Cyberyeti]

The only thing that changes if east overcalls is that it gives you a reason to believer the diamond finesse is working if you can determine that is the keycard that's missing