[Bbradley62]

From Just Play Bridge, so no hand record. Pard deals, no interference:
1N-2♣
2♦-3♦
3N

2♦ is explained as 2-5♣; 2-5♦; 2-3♥; 2-3♠, 15-17HCP.
3♦ is 5+♦; 13+ total points.
3NT is exactly the same as 2♦.

Are there any circumstances under which GIB would not bid 3N over 3♦? Maybe if he had both diamond support and a max he'd bid 4♦ instead, so the 3N explanation is the best he can do?

[Stefan_O]

Bbradley62, on 2016-April-24, 14:09, said:

Are there any circumstances under which GIB would not bid 3N over 3♦? Maybe if he had both diamond support and a max he'd bid 4♦ instead, so the 3N explanation is the best he can do?

Cannot answer that one, but I think in a std system (already having denied 4cd major) 3♥ and 3♠ would show a stopper in the suit and indicating NO stopper in the other major (to avoid bad 3NTs).

I never saw Gib use stuff like that, but wish somebody could add it to the bidding-db