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Detail specifications 21BD - Level 2

The Responder's first bid showing support to a 1 in a suit opening (2/1)

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The responder shows support after a level 1 opening bid
Apply the law of total tricks ! The number of trump cards you hold matters more than your HCP :
   Simple raise to the 2-level. With at least 3 cards in the Major and 5-9 HCP. With 3 cards support and 10-11HCP, give preference to a 1NT forcing bid...
   Limit raise at level 3 With 11-12 HCP and 4 cards.
   2/1 then support.
    at level 4 With 13-14 HCP and 3 trumps.
    at level 3 With 15+ HCP and 3 trumps.

  Jacoby 2NT with 4+ trumps & 13+ support points
  Splinter 4+ trumps & 13+ support points and a singleton.
Raises or jump (simple or double) raises are not forcing. The opener may pass. Shifts are the only forcing bids : - for one round at the 1-level, - autoforcing at the 2-level, - jump shifts are game forcing.
SWNE
1
Pass
4
10
7
3
K
10
8
4
5
A
K
Q
8
4
Problem E40011 4 With 13 HCP you could bid 2, forcing to game, or even a Jacoby 2NT ... but here it is probably wiser to show your 4 cards in and your shortness by using a splinter
 
SWNE
1
Pass
2
10
7
3
K
8
4
J
8
5
Q
J
8
4
Problem E40153 2 With 5-10 HCP and a 3 cards fit with the opener, bid a simple support at 2