1ª   -             1NT
2X    -             2ª                  Normally two cards, if three cards very bad hand

1M   -             4M                 Gambling, very unbalanced distribution with one good honor anywhere

1M   -             1NT
2X    -             4M                 Approx.13 HCP and fit but with bad honors

Bergen Raises, with four cards fit

1ª   -             3ª                  Preemptive

1ª   -             3¨                 Limit raise 11-12 DP
                      opener 3(other) M rebid asking shortness (Romex Responses)

1ª   -             3§                  Constructive, 6-10 DP, if opener bid 3¨; 3ª shows minimum; 4ª shows

                                            maximum and cue-bids shows very good hands

Splinter

1ª   -             4§                  13-15 HCP, singleton club with four card support

1ª   -             4¨                 13-15 HCP, singleton diamond with four card support

1ª   -             4©                  13-15 HCP, singleton heart with four card support

1©   -             4§                  13-15 HCP, singleton club with four card support

1©   -             4¨                 13-15 HCP, singleton diamond with four card support

1©   -             3NT                13-15 HCP, singleton spade with four card support

Unbalanced forcing raises

1ª   -             3NT                10-12 HCP with any singleton;

                                            4§ asks shortness (Romex Responses)

1©   -             3ª                  10-12 HCP with any singleton;
                      3NT asks shortness (Romex Responses)

Jacoby 2 NT

1M   -             2NT                Shows good 13+ HCP, balanced hand and four card support

 ?

- three level new suit shows singleton,

- four level new suit shows (5-5) or (6-5)

- 4M shows very minimum opening

- 3NT shows balanced 14-15 HCP.

- 3M shows 16+ HCP