1. Jacoby Transfers
2. Leeway Minor Slam Relay (MSR)
3. Minor Suit Stayman (MSS)
4. Smolen
5. Stayman
6. Texas Transfers
7. Three of a minor invitational
8. Two-Way Two-No (2W2N)

1. Jacoby Transfers. Use this with any hand containing a 5-card or longer major as long as the hand does not also contain a 4-card major. Can be used as either a "drop-dead" bid, a game invite or a slam invite; but see Texas Transfer for the one-suited major "game-only" hand.

   Example 1: ♠ KQ9873 ♥ 743 ♦ 32 ♣ 43. Bid 2♥ and pass partner's spade call.
   Example 2: ♠ KQJ873 ♥ K43 ♦ 82 ♣ K3. Bid 2♥. When partner bids 2♠, you bid 4♠. Since you didn't choose Texas Transfer in the first place, partner understands by inference that your hand will make slam as long as partner's aces and kings are in the right places.

2. Leeway Minor Slam Relay (MSR). This tool fills an important gap that exists in standard bidding⁽¹⁾. Use it to describe a hand that is single-suited in a minor and is slam oriented. It must not contain any other four-card or longer suit.
   1. A 3♥ bid shows clubs; a 3♠ bid shows diamonds.
   2. Holding a small doubleton in your suit, the 1NTer refuses the transfer with a 3NT call. This must end the auction unless the responding hand is strong enough to demand a slam facing most NT openers.
   3. With a better holding in the transferred minor, partner accepts the transfer. After acceptance, most slam methods are available: Kickback and cue bidding particularly recommended.

   Example: ♠ K9 ♥ 3 ♦ AQJ9632 ♣ K43. Bid 3♠. If partner answers with 3NT, this hand is not so hot for a diamond slam. If he bids 4♦, you are off to the races.

   Consider that the 1NTer might hold any of the following hands facing the hand above.

   1. ♠ QJ873 ♥ K4 ♦ K84 ♣ AQJ. (Yes, a mangy 5-card major.) He accepts the transfer by bidding 4♦. Holding no Blackwood No-Nos⁽²⁾ responder uses Kickback (4♥) and the auction screeches to a halt in 5 when we discover that two key cards are missing. And a bonus: if the Kickback reply happens to be 4NT, one can pass for the extra score (at matchpoints).
   2. ♠ AQ73 ♥ KQJ3 ♦ 74 ♣ A92. With a puny doubleton in diamonds, but excellent slam controls in all other suits, opener can go directly to Kickback on his own with a notrump slam in the crosshairs.
   3. ♠ A7 ♥ Q874 ♦ K74 ♣ AQJ2. No matter where partner's shortness may be, this 1NT opener fits well enough to at least investigate for slam. This hand accepts the transfer and mentally prepares for a cue bidding sequence since the hand does contain a Blackwood No-No [the heart suit, Patricia]. With the actual partner hand, responder's second call is Kickback, and you sail into 6♦. Others will struggle to diagnose both the heart shortness and the excellent diamond fit.
      
      
3. Minor Suit Stayman. This convention is well documented elsewhere and is not detailed here. Basically, MSS allows us to explore for minor suit slams in hands where we hold nine or more cards in the minors (a two-suited hand). It also does double duty as the drop dead for diamonds in the following sequences.
   1NT - 2♠ - 2NT - 3♦ - pass
   1NT - 2♠ - 3♣ - 3♦ - pass
   1NT - 2♠ - 3♦ - pass
   
   
4. Smolen. Like Minor Suit Stayman, this convention is covered in excellent detail elsewhere and is not repeated here. Try BridgeGuys. In short, we use it for major two-suiters that are game invites or better.
   
   
5. Stayman. Most hands containing a four-card major need to begin with Stayman⁽³⁾. The only add-on Leeway needs is the flat notrump invite. For example, when holding  ♠ A83 ♥ J98 ♦ QJ94 ♣ J93. Since the 1NT - 2NT sequence is taken for something else, one must invite the notrump game via Stayman. This hand is revealed when responder's second call is 2NT. One must of course alert the 2♣ call with "Does not promise a 4-card major."
   
   
6. Texas Transfer. This call is used for two hand types; both types start with a 4-level transfer bid:
   4♦ when holding five or more hearts,
   4♥ when holding five or more spades.
   Also, the hand must not contain four cards in the other major; for that hand, try Section IV - Smolen.
   
   
   1. Type One is this: ♠ 3 ♥ KJ9876 ♦ QJ43 ♣ Q93. It contains a six-card or longer major, no 4-card major, sufficient strength for game, and no designs on slam (a "game and only game hand").
      
      
   2. Type Two is this: ♠ void ♥ AQJ9764 ♦ KJ3 ♣ K93. This hand is a slam goer of the first magnitude and needs little more help than to know how many slam controls partner owns outside the spade suit. Enter "Exclusion Blackwood."
      
      After the 1NTer's forced 4♥ call, a new suit bid shows a void and requires the 1NTer to reveal in step order how many key cards he owns outside the void suit (0,1,2,3). And yes, 4NT is one of the allowed steps.
   
   
7. Three of a minor invitational. This tool handles one specific hand that can be described no other way: ♠ 3 ♥ 876 ♦ AQJ943 ♣ 1093.
   No, it is not a 7-point hand; it's a five-trick hand that is just three trick shy of game (3N) if the hand facing it has the one missing diamond honor and three other tricks (not a great challenge to put on the 1NT opener).
   So, over 1NT, bid 3♦ with this collection. Stated as rule: You need a six- or seven-card minor suit containing three of the suit's four face cards. The 1NTer must pass when he does not hold the one missing honor; bravely bidding 3NT when he does hold it.
   The running suit makes all the difference between a game bonus and a drop dead bid. For example, the 1NT bidder can hold any of these hands.
   1. ♠ QJ9 ♥ KJ94 ♦ K8 ♣ KQ72. Seeing holes in three suits informs partner that 3NT is a rather high risk contract. He may choose to bid it anyway, but at least he knows.
   2. ♠ QJ9 ♥ AK54 ♦ K6 ♣ A762. Partner can almost claim 3NT (or 4) before the auction ends.
   3. ♠ J64 ♥ KQJ4 ♦ K6 ♣ AK62. You may be the only partner in the room who gets the disaster alert for spades. Others who hold this maximum will be unstoppable.
   
   
8. Two-Way Two-No (2W2N). The 1NT - 2NT sequence is our gateway for two very different kinds of hands. For both types, the 1NTer is required to say "Three Clubs" (no exceptions unless your RHO preempts).
   
   Then the fun begins.
   1. Type 1 is the well known drop dead in clubs where you hold ♠ 432 ♥ 75 ♦ 86 ♣ J87543.
   2. Type 2 is a lesser known problem hand: the 4-4-4-1 slammish hand ⁽⁴⁾. Let's say  ♠ KJ32 ♥ AQ75 ♦ 8 ♣ K943. This hand has four important attributes, and the 1NTer needs to know all of them:
      1. It's slammish if the 1NTer holds little if any diamond duplication;
      2. There are three suits eligible to become our slam trumps, not just two;
      3. He must hold at least four cards (not 3) to have a suit fit;
      4. And unlike the other multi-suited bids in the other sections of this document, you hold just four cards in these suits; in other words, no five-carder.

         The significance of the four-carder versus the five-carder cannot be overstated. A nine-card fit (rather than eight) increases the playing value of a hand by about a trick and a half. Using 2W2N with this hand allows you, by inference, to inform partner about a five card auxiliary suit when you use one of the other Leeway conventions: for example, starting with Stayman and following up with a diamond bid.

         When responder does not pass the opener's mandatory 3♣ call, he reveals this strong three-suiter by bidding his singleton (3NT reveals the club singleton, so listen carefully).
         
         The 1NTer has two choices on his next call:
         1) pass holding duplication in partner's singleton; or
         2) Bid 4 of a suit in which you have four (can be five) pieces opposite one of the 2W2N-bidder's suits.
         And don't get cute about it, simple suit agreement at this point paves the way (This gadget is fancy enough already). After announcing suit agreement, your partnership is off to the races again with cue bidding or Kickback.

In conclusion, using the Leeway amalgamation, one is very hard pressed to suggest any combination of cards that is difficult to bid optimally over partner's standard 15-17 one notrump opening.

Footnotes

1. One word about another popular method: Four-Suit Transfers (4ST). For the MSR examples here, 4ST will probably work equally well. Unfortunately, 4ST's leap to three clubs precludes us from showing the one-suited game-invitational hand (See Section VII). Also, 4ST disables us from revealing the 2W2N hand shown in Section VIII.
   
   
2. A Blackwood No-No is either a void, or any non-trump suit where the defenders can take two off the top. One must use another method such as Exclusion or cue bidding when holding a Blackwood No-No.
   
   
3. The big exception being the 4-4-4-1 slammish hand covered in Section VIII.
   
   
4. Advanced Bridge Bidding for the 21^st Century. Max Hardy. P 98. ISBN 1-58776-125-6.