Taken from Andrew Robson Bridge web site.

Rule of 1 Drawing Trumps
Rule of 2 Leading High from a Doubleton
Rule of 3 Support Partner's Overcall with a 3 card suit
Rule of 4 Support partner straight away when you hold 4 of his major suit
Rule of 5 A player bidding two suits guarantees 5+ cards in his first bid suit
Rule of 6 When opener repeats the suit it contains 6 cards
Rule of 7 When declarer in 3NT duck the lead applying the rule of 7
Rule of 8 Eight trumps bewteen the partnership is a fit
Rule of 9 The lead of a 9 suggests shortage
Rule of 10 The suit quality overcall test
Rule of 11 Calculating the layout in 3NT
Rule of 12 Always open the bidding with 12 points
Rule of 13 Each suit contains 13 cards
Rule of 14 When to respond 1NT to your partner's opening bid
Rule of 15 Rebid 1NT with 15 points
Rule of 16 Double 1NT penalties with 16 points
Rule of 17 As an opener jump in NT for you second bid
Rule of 18 With 4 card support for partner use the LTC
Rule of 19 With 19 points bid game if partner bids
Rule of 20 Open the bidding when points + cards in two suits = 20
Rule of 33 Bidding a Slam