This is an alternative bid for users of a strong (16+ HCPS)
club system.  The advantage of this system is the ability to
use five card majors and still have available 2 diamonds as
an open bid.  The overall concept is to have 1 diamond
designate all unbalanced minor suit hands.  In most systems
balanced 5 card minors with limited values are opened 1 no-
trump. Then 2 clubs is usually used to show all mini-roman
hands.  I hope you find this useful.  If you have comments,
please e-mail me or post.  I would love to here suggestions
and improvements.

1.   1 Diamond 11 to 15 HCP's with a 5+ card minor suit and
     generally unbalanced.  You may have a 4 card major but
     with 5-5 hands open one of a major.  With 6 of a minor
     and 5 of a major open 1 diamond with a very strong
     minor otherwise show the major firs

     A.   1 heart:  4 plus hearts 6 plus HCP's

     B.   1 spade: 4 plus spades 6 plus HCP's

     C.   1 no-trump forcing denies major and is essentially
          “inverted minor?showing 10+ HCP's  and is looking
          for no-trump.

     E.   2 clubs:   not forcing, usually shows a bust hand
          and is asking opener to bid his minor and get out.
          Responder may also use this bid if he has support
          for one minor but not the other and has intentions
          to preempt later in the auction.

     F.   2 diamonds:  transfer to hearts showing 6+ hearts
          and either a week jump shift or a strong jump
          shift.  Therefore the bid is always forcing to the
          transfer suit or to openers original suit.
          Responder will usually pass.  If responder bids
          new suit, he has a strong jump shift and is
          forcing. Bidding the transfer suit is law of total
          tricks.

                    1.   Responder will accept the transfer
                         with 2 card support.  He will use
                         law of total tricks to accept to
                         other levels (i.e. 3 card support
                         to the 3 level etc.).  Without
                         support, responder bids his minor.

     G.   2 Hearts: Transfer to spades. See F above.

     H.   2 Spades: Transfer to clubs.  See F above.

     I.   2 no-trump:  10-12 HCP's balanced denies a major.

     J.   3 clubs, 4 clubs, 5 clubs:  shows tolerance for
          both minors  and is preemptive.

     K.   3 diamonds: preemptive in diamonds.  With a strong
          jump shift in diamonds use 1 no-trump.

     L.   3 No-trump: to play.

2.        Responses to 1 diamond 1 heart.

     A.   1 spade:  natural denies 4 card support for
          hearts.  Minor remains unknown.

          1.   1 No-trump: not forcing.  Generally balanced
               denies 5 hearts.

          2.   2 clubs: not forcing generally shows 5 hearts
               or unbalanced.

          3.   2 diamonds: forcing asks for 3 card fragment
               and or for opener to further describe his
               hand (old minor forcing).

               A.   2 hearts: minimum with 3 card heart
                    support (2 spades asks for minor suit..

               B.   2 spades:  natural ostensibly shows a 5-
                    6 hand undisclosed minor (2 no-trump
                    asks).

               C.   2 no-trump:  minimum with 2 doubletons
                    (4-2 in the majors).

                    1.   3 clubs:  bailout minimum
                         invitational.  Opener passes or
                         corrects.

                    2.   3 diamonds:  forcing looking for
                         minor suit slam.
                         a.   3 hearts:  show clubs
                         b.   3 spades:  show diamonds

               D.   3 clubs:  natural shows stiff heart.

               E.   3 diamonds: natural shows stiff heart.

               F.   3 hearts: maximum with 3 card support (3
                    spades asks for minor).

               G.   3 spades: maximum balanced showing clubs
                    (4225).

               H.   3 no-trump: maximum balanced showing
                    diamonds (4252).

          4.   2 hearts: not forcing.  Usually shows 6+
               hearts or very strong 5 card suit.

          5.   2 spades: not forcing. Shows 4+ spades

          6.   2 no-trump: invitational.

          7.   3 clubs:  natural forcing to game

          8.   3 diamonds: forcing and natural

          9.   3 hearts: 6+ and invitational

          10.  3 spades:  4+ invitational

          11.  3 no-trump: to play.

     B.   1 no-trump:  denies 3 card support for hearts or
          4+ spades.

          1.   2 clubs:  minimum.  Asks opener to pass or
               correct.

          2.   2 diamonds: forcing (old minor forcing) to
               game.

               A.   2 hearts:  shows 2-2 in the majors
                    minimum.
                    1.   2 spades: natural usually shows 5+
                         spades 6+hearts.
                    2.   2 no-trump: asks for minor suit
                         distribution (3 clubs or 3 diamonds
                         showing the 5-4 in the minors).  A
                         raise of the minor to the 4 level
                         is RKC in that suit.  This applies
                         to all the remaining bids in this
                         group.

               B.   2 spades: shows 2-2 in the majors
                    maximum (2 no-trump asks for minor as
                    above).

               C.   2 no-trump: shows 3-1-4-5 minimum.

               D.   3 clubs shows 3-1-4-5 maximum.

               E.   3 diamonds: shows 3-1-5-4 minimum.

               F.   3 hearts:  shows 3-1-5-4 maximum.

          3.   2 hearts:  not forcing shows 6+ hearts

          4.   2 spades:  shows 5+ spades 6+hearts
               invitational.

          5.   2 no-trump:  natural and invitational

          6.   3 clubs:  natural and invitational

          7.   3 diamonds:  natural and invitational

          8.   3 hearts:  natural 6+ hearts and
               invitational.

     C.   2 clubs or 2 diamonds:  natural.  Shows 3 card
          heart support.

          1.   All bids are essentially natural to 3 hearts
               (and 3 no-trump or 4 hearts).  New suits are
               forcing and rebids are invitational or not
               forcing (i.e. 2 hearts minimum, 3 hearts
               invitational etc.).

          2.   3 spades, 4 clubs, 4 diamonds are all
               splinters and game forcing.

     D.   2 hearts:  4 card support minimum.

          1.   2 spades:  forcing to game.  Asks for
               splinter.

               A.   2 no-trump:  shows spade splinter with
                    clubs.

               B.   3 clubs, 3 diamonds:  shows that suit
                    with other minor being the splinter.

               C.   3 hearts: denies splinter with clubs.

               D.   3 spades:  denies splinter with
                    diamonds.

               E.   3 no-trump:  show spade splinter with
                    diamonds.

          2.   2 no-trump:  forcing one round.  Asking for
               minor suit.  This bid is usually for hand
               evaluation for game.

          3.   3 hearts: invitational

          4.   3 spades, 4 clubs, 4 diamonds: splinters.

          5.   3 no-trump, 4 hearts: to play.

     E.   2 spades:  4 card heart support usually balanced
          maximum showing clubs (2-5-2-4) 14 or 15 HCP's.
          Further bids are control showing for slam.

     F.   2 no-trump: shows 5-5 or better in the minors.

          1.   3 clubs, 3 diamonds are drop dead.

          2.   3 hearts shows 6+ not forcing.

          3.   3 spades forcing looking for minor suit slam.

               A.   3 no-trump: minimum.

               B.   4 clubs: maximum with good suit (2 of
                    top 3 honors).  Denies good diamond suit

               C.   4 diamonds:  maximum with good suit.
                    Denies good club suit.

               D.   4 hearts:  maximum shows solid club
                    suit.  Denies good diamonds.

               E.   4 spades: maximum shows solid diamond
                    suit.  Denies good clubs.

               F.   4 no-trump:  shows  AK,AK in the minors.

     G.   3 clubs: natural 6+ suit.

     H.   3 diamonds:  natural 6+ suit.

     I.   3 hearts: maximum 4+ hearts, usually balanced,
          showing diamonds (2-4-5-2).  New suits are control
          showing and looking for slam.

     J.   3 spades: splinter showing clubs and maximum.
          Because the following bids force to game, these
          are hands where responder biding 1 heart made your
          hand very good (ostensibly 18 to 19 dummy points
          with good values).  If your hand is unbalanced but
          not good enough, either bid minimum 4 card
          unbalanced or maximum balanced 4 card support.

     K.   3 no-trump:  gambling with long solid minor.
          Usually a spade stopper.

     L.   4 clubs:  splinter in diamonds with 4 card heart
          support (see 3 spades above).

     M.   4 diamonds:  splinter in clubs with 4 card heart
          support (see 3 spades above).

     N.   4 hearts:  spade splinter with diamonds (see 3
          spades above).

3.   Responses to 1 diamond, 1 spade.

     A.   1 no-trump: denies 3 card support for spades.

          1.   2 clubs: drop dead.

          2.   2 diamonds: old minor forcing to game.

               A.   2 hearts:  shows 2-2 in the majors
                    minimum.
                    1.   2 spades: establishes spades as
                         trump for slam purposes.
                    2.   2 no-trump: asks for minor suit
                         distribution (3 clubs or 3 diamonds
                         showing the 5-4 in the minors).  A
                         raise of the minor to the 4 level
                         is RKC in that suit.  This applies
                         to all the remaining bids in this
                         group.

               B.   2 spades: shows 2-2 in the majors
                    maximum (2 no-trump asks for minor as
                    above).

               C.   2 no-trump: shows 1-3-4-5 minimum.

               D.   3 clubs shows 1-3-4-5 maximum.

               E.   3 diamonds: shows 1-3-5-4 minimum.

               F.   3 hearts:  shows 1-3-5-4 maximum.

          3.   2 hearts: natural not forcing

          4.   2 spades: 6+ spades not forcing.

          5.   2 no-trump:  invitational.

          6.   3 clubs natural and forcing

          7.   3 diamonds:  natural and forcing

          8.   3 hearts natural and invitational

          9.   3 spades:  6+ spades and invitational.

          10.  3 no-trump: to play.

     B.   2 clubs or 2 diamonds:  natural, minimum showing 3
          card spade support.

          1.   All bids are essentially natural to 3 spades
               (and 3 no-trump or 4 spades).  New suits are
               forcing and rebids are invitational or not
               forcing (i.e. 2 spades minimum, 3 spades
               invitational etc.).

          2.   4 hearts, 4 clubs, 4 diamonds are all
               splinters and game forcing.

     C.   2 hearts:  4+ spades maximum usually balanced
          showing clubs.  Further bids  are control showing
          and looking for slam.

     D.   2 spades:  4+ spades minimum.

          1.   2 no-trump:  forcing to game.  Asks for
               splinter.

               A.   3 clubs, 3 diamonds:  shows that suit
                    with other minor being the splinter.

               B.   3 hearts:  splinter in hearts with
                    clubs.

               C.   3 spades: splinter in hearts with
                    diamonds.

               D.   3 no-trump:  denies splinter with
                    diamonds.

               E.   4 clubs:  denies splinter with clubs.

          2.   3 clubs:  forcing one round.  Asking for
               minor suit.  This bid is usually for hand
               evaluation for game.

               A.   3 diamonds shows diamonds.

               B.   3 hearts shows clubs.

     E.   2 no-trump: shows 5-5 in the minors (see 1 heart 2
          no-trump).

     F.   3 clubs:  6+ suit (see 1 heart, 3 clubs).

     G.   3 diamonds:  6+ suit (see 1 heart, 3 diamonds).

     H.   3 hearts: 4+ spade support unbalanced maximum but
          not enough to show splinter right away.

          1.   3 no-trump asks for splinter.

               A.   4 clubs:  natural with diamond splinter.

               B.   4 diamonds:  natural with club splinter.

               C.   4 hearts:  heart splinter with clubs

               d.   4 spades:  heart splinter with diamonds.

     I.   3 spades:  4 card spade support, balanced, with
          diamonds.

     J.   3 no-trump:  gambling usually with a heart
          stopper.

     K.   4 clubs:  natural with diamond splinter and 4 card
          spade support.

     L.   4 diamonds:  natural with club splinter and 4 card
          spade support.

     M.   4 hearts:  heart splinter with clubs.

     N.   4 spades:  heart splinter with diamonds.

3.   After interference.

     A.   1 diamond, double:

          1.   Pass:  broke or no suitable bid.  Partner
               will pass or correct to 2 clubs.

          2.   1 heart, 1 spade:  not forcing and
               destructive.

          3.   1 no-trump: 9-10 points balanced.

          4.   2 clubs, 3 clubs...:  preemptive with law of
               total tricks in the minors.

          5.   2 diamonds:  transfer to hearts (week jump
               shift)

          6.   2 hearts:  transfer to spades (week jump
               shift)

          7.   2 spades:  transfer to clubs (week jump
               shift)

          8.   Redouble:  10+ HCP's.

     B.   1 diamond, overcall:

          1.   Negative doubles are in effect.

          2.   New suits show 5+ cards and forcing.

          C.   1 diamond, 1 major, overcall:  here we use a
               support type system.  If opener is able to
               bid his minor suit on the 2 level, this is
               natural and 3 card support for the major.  If
               opener is unable to bid minor then normal
               support double is in effect.  If opponent
               bids your minor pass for hopeful penalties.
               With this in mind the following.

          1.   Double:  4 card support with clubs.

          2.   2 of the major: shows 4 card support with
               diamonds.

          A few examples

          1.   1d,1h,1s,:  2 clubs or diamonds is natural
               with 3 card heart support; double is 4 card
               support with clubs and 2 hearts is 4 card
               support with diamonds.
          2.   1d,1h,2d,:  here double would be normal
               support and 2 hearts normal 4 card support.
               Pass is either no 3 card support or he has
               diamonds.
          3.   1d,1s,2h,:  same as 2.
          4.   1d,1s,2c:  here all applies.  2 diamonds is
               natural with 3 card support, double shows 4
               card support with clubs, and 2 spades shows
               diamonds (how convenient).

Reference