With four diamonds and four clubs, open 1¨ first

1§    -             1¨
1NT -              ?

                      - 2m               : to play

                      - 2M               : game-forcing with 5+ diamonds and 4+ major

                      - 3m               : invitation

                      - 3M               : short major, game-forcing                          

1©   -             1ª
1NT -              ?                                         after 1© opening; used new minor forcing (NMF)

            X

            Pass

1§                     1ª              after takeout double; return to opening suit is sign-off, used NMF

1NT                    ?

            Pass

1m   -             1M
1NT -             ?                                          used Check Back Stayman

Responses to Check Back Stayman

1m   -             1M
1NT  -             2§
 ?

- 2¨                                     : minimum, no fit
- 2major          : minimum with fit
- 2(other) major : maximum with fit
- 2NT                                    : maximum no fit

General

1§    -             1ª
1NT -              ?

                      - 2¨               : sign-off with four spades and five diamonds
                      - 3§                : sign-off with four spades and five clubs
                      - 3¨               : invitation with five spades and five diamonds
                      - 3©                : invitation with (5-5) majors
                      - 3ª                : invitation with very good suit
                      - 4§                : singleton with good six cards, slam try
                      - 4¨               : singleton
                      - 4©                : singleton, if heart is trump 3ªshows singleton

1¨   -             1ª
1NT -              ?

                      - 3§                : sign-off with four spades and six clubs

                      - 3¨               : invitation with four spades and 4+ diamonds

1m   -             1ª
1NT -             2§

 ?

If opener shows minimum, 2©, 2ª and 3§ to play
If opener shows maximum, all bids are game-forcing

1§    -             1ª
1NT -             2§
2X    -              ?

                      - 3©                : game-forcing with (5-5) major, after 2 NT rebid five spades and four hearts possible
                      - 3¨               : natural, game-forcing
                      - 3ª                : slam try
                      - 2NT              : always forcing and asks for distribution

After support, jump with new suit is slam try and shows shortness

1§    -             1ª
1NT -             2§
2X    -             2NT
 ?

- 3§                : five clubs
- 3¨               : shows four hearts and four clubs

- 3©                : shows four diamonds probably with five clubs

- 3ª                : shows (3-4-3-3) after 2ª rebid

                        now 4¨ transfer to heart

- 3NT              : (3-3-3-4) after 2ª rebid

1¨   -             1ª
1NT -             2§
2X    -             2NT
 ?

- 3§                : four clubs
- 3¨               : shows four hearts and four clubs
- 3©                : shows five diamonds

- 3NT              : (1-4-4-4) after 2¨ rebid

                        now 4¨ is transfer to heart

1¨   -             1©
1NT -             2§
2X    -             2NT
 ?

- 3§                : four clubs
- 3¨               : five diamonds
- 3NT              : after support (3-3-4-3)