The key aspect of the system is to distinguish the shape at the first opportunity: (semi)balanced vs. unbalanced+ (7+card, 10+cards in 2 suits).

• A jump to 3^rd level is most often unbalanced
• All goulash 2-suiters (65+) are included in 2^nd level openings
• (Semi)balanced hands are divided to a minimum or extras+ (2♣ rebid)

Show Major fit at the first opportunity.

• 1♥-2♦ and 1♠-2♥ are the main Major raises.
• In 1X-1M-? sequence, we distinguish number of cards in the Major: no fit (0-2 cards) = 1NT, 3-card fit = conventional, and 4-card fit = 2M/3M/Splinter or 1♦-1♥-2♠ or 1♦-1♠-3♥ with 18-19 BAL.

As responder, give preference to 4-card Major over 5+card minor after 1^st-level openings. 

1NT rebid always shows a minimum hand and misfit (maximum 2 cards in partner's Major, but often a singleton).

2♣ bid show extras from both players and at least an invitation.

• The following 2♦ relay shows a GF hand or extras, the rest of the bids show minimum and distribution.
• Careful, we play non-forcing reverses in these sequences: 1♣-1♦^(♥)-2♦; 1♣-1♥^(♠)-2♦/♥; 1♦-1♠-2♥. 
• Exceptions:
  1♦-2♣ = F1!, but can be weak ~2 HT with (5)6+♣

  1♣-1♠
  2♣ = NF!, minimum, trump-oriented

  1♣-1NT
  2♣ = NF!, minimum, trump-oriented
  
  1♦-2♣
  2♦ = NF!, minimum with 5+♦
  

  
  1♦-1M
  2♣-2♦/2M = NF!, minimum, we want to play NT from the strong hand, rest of the bids are GF

Standard jumps after 1^st level openings show 6-card and invitational hand (NF!).
1♣ - 2♦/♥/♠/3♣
1♦ - 2♥/♠/3♣
1♥ - 2♠/3♣/♦
1♠ - 3♣/♦/♥

Double jumps

• Preemptive with a 7+card suit 1♣-3♦/♥/♠,1♦-3♥/♠, 1♥-3♠ 
• Splinter 1♥/♠-4♣/♦, 1♥/♠-3NT (splinter in other Major) 
• Jump to 4M is always natural and to play: 1♣/♦-4♥/♠, 1♥-4♠, 1♠-4♥.

When we denied Major fit, bidding a Major suit shows shortness in that suit.

1♣-1♠/NT/2♣/2♦
1♦-1NT/2♣/♦

When we show a Major fit, one of the following rules apply:

• After conventional raise: 1♥-2♦; 1♠-2♥ – special convention.
• Standard raise 1♥-2♥; 1♠-2♠ – we show the second suit, mostly 10 cards in those 2 suits.
• We opened a minor, 1♣-1♦^(♥)/♥^(♠)-2♥/♠; 1♦-1♥/♠-2♥/♠ – we show shortness and 2NT is general invite+, 3M is shape.
• If we show a general (INV)GF+ with 2NT or similar bid, new suit below 3M is natural 4+card, new suit about 3M is shortness: 1♣-1♦^(♥)-2♥-2NT, 1♥-2♦^(♥)-2♠^A, etc.
• In competitive bidding – the new suit is natural, and the opponent's suit is shortness.
• If we have shown a fit on the 3^rd level – the new suit is shortness, and 3NT is slam interest without shortness.

Slam bidding is based on knowing the shape and honor range and then we react in 3 ranges:

• With a minimum – return to trumps
• With extras+ – show a control/shortness/3NT, you have the option to ask for key cards later
• With a maximum – you can ask for key cards directly or show a control if you want partner to ask for any reason.
• 4NT is BW for Major, if we have show both Majors and no fit yet, 4NT is BW♠
• 4♣/♦ are optional minor BW for the minor.
  We DO NOT play optional minor BW in competitive bidding or as a weak hand after your partner opened 2♣.
• Exclusion BW is a clear jump in a new suit to the 5^th level if we have shown a fit. Exclusion BW is never on the 4^th or lower level, although it shows a void. The responses to Exclusion BW are: 0, 1, 1+Q, 2, 2+Q, etc.