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As an opening Modifier

In every system, a 3 opening is preemptive.

After an opening of one of a suit Modifier

After partner opens at the one level, 3 is a jump shift. Its meaning varies greatly, depending on the system, but is typically either very strong or very weak.

After a 1NT opening Modifier

After partner opens 1NT, 3 can have a number of meanings, such as

  • Splinter bid
  • Puppet Stayman

After partner double's RHO's weak two opening Modifier

3 is a response bid to Lebensohl.

Bids

1-1-1-1-1NT
2-2-2-2-2NT
3-3-3-3-3NT
4-4-4-4-4NT
5-5-5-5-5NT
6-6-6-6-6NT
7-7-7-7-7NT

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