Swedish Jacoby
Jacoby 2NT responses used in Sweden
In Sweden the most used answers are this,
1M - 2N 3C any minimum
3D extras with no singletons
3H extras with singleton club
3S extras with singleton diamond
3N extras with singleton other major
4m void splinter
4M void other major
After 1M - 2N - 3C, 3M is layoff. 3D is asking singletons and other is cuebids.
After 1M - 2N - 3C - 3D you answer like this
3H Singleton club
3S Singleton diamond
3NT Singleton other major
4m no singleton, cuebid in m
4M no singleton,
NT able to cuebid a minor.
When playing these answers you can use 2NT on invitational values and then 1M - 3M is preemptive.
If the opener shows minimum and you only have a limit raise you are able to play 3M (1M -2N - 3C - 3M)