Here is how the rule set exists in its current form as of March the 19th, taken directly from a document in my iPad where they're all kept for easy access:
DRAUGHT RULES:
MAJOR TRIAD
-If major triad chord replace with Maj6 (add9)
-Major triad can be replaced with relative minor triad (Mostly bass line - if G triad play G/E)
-One chord can be made a major 7 - major 7 can be replaced by the mIII or mVI (eg. Cmaj7 may become Em7 or Am7
-Add the flattened fifth to a minor triad to make it half diminished
1-4-5 AND ii-V
-If there exists more than one 4-5 introduce a ii-V in thief key of the 5 chord every second time
-1-4 add minor ii-v in relative minor key of 4. Eg. F-Bb play F- Adim7-D7b9 - Bb
-If V-I add ii before V OR VII9
-Root chords that do not start or resolve a line can be replaced with vi
-The vi can then include ii-V afterwards
-The ii chord can be substituted for a ii#9 b5 (if going to a ii-V)
-If a one begins a chorus, add V7 before it
BACKCYCLING
-If going to a V7, on each beat of the preceding bar backcycle into it (if G7 play
| B7 Bb7 A7 Ab7 | G7)
-Can cycle down the circle of fifths to target chord (Eg. If aiming for Cmaj7, precede it with a G7, then Precede G7 with a D7, A7, etc
VI7 CHORD-
-Minor vi chord can be replaced by VI7 (B7 instead of Bm7 D)
-VI7 can be placed in front of ii of key (eg. B7 to Em on key of D)
-If 4-1 replace 1 with VI7 (Bb to D7 in key of F)
MISC
-Minor 7 chord - add dominant seventh chord who's root is a fourth below (or 5th above) before chord
-Dominant 7th chord - add minor 7th chord who's root is a fourth below (or 5th above) before chord
-Dominant chord (7,9,11,13) switch bass note with tritone. Eg. C13 becomes Gb+9
-Replace 3rd with 4th in any chord for colour without changing too much (if melody is not 3rd)
-ii-I - play diminished chord between. Eg. C Dm7 D#halfdim C/E
-Dominant 7th - replace 3rd with 11 (C7(11))
-Any strong target chord can be preceded by a Dom 7 a fifth up
-Dominant 7th chords can be altered into (sharp 9 sharp 5). Eg instead of G7 play Eb/G
WITHOUT THINKING OF MELODY
Before or after a dominant chord, a dim7 chord a major 3rd up can be placed. (eg. G7 - Bmin7b5 can be put before or after
Before or after a dominant chord, a maj7 or dom7 chord a minor 3rd up can be placed (Eg. G7 - Bb7 or Bbmaj7 can be put before or after
REMOVING CHORDS
If 2-3 chords per bar, remove secondary chords and substitute first chord using one of the above rules
TENSION NOTES
Major 6th - add 9
Minor 6th - add 9
Major 7th - add 9 or #11
Minor major 7th - add 9
dominant 7th - add 9 OR b9, #9, 11, #11, 13, b13
Minor 7th - add 9, 11
Minor 7th (lowered fifth) - 9, b13
Diminished 7th - any note a whole step above a basic chord tone
CONTEXTUAL NOTES:
-No tritone sub if the melody is within a semitone of the tritones root
-If a melody note conflicts with the third of a substituted chord the third can be replaced with the fourth.
-Do not play more than two tritone substitutions in one passage until at least the second verse.
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