Lebensohl
Relay bidding after 1NT interference and weak-two doubles.
Competitive
Weak Twos
Slam
System
Competitive
Raises
Passed Hand
Major Raises
Slam Try
Opening
System
Notrump
Competitive
Two-Suited
Relay
Ogust
Structured inquiry into the quality of a weak-two opening.
RKCB
Roman Keycard Blackwood — precise slam investigation using 5 keycards.
2/1 Game Force
The foundational two-over-one response system for game-forcing auctions.
Negative Doubles
Showing unbid suits after an overcall when a natural bid isn't available.
Bergen Raises
Precise 4-card major raises encoding strength with jump bids in the minors.
Drury
Checking if a 3rd/4th-seat major opening is full-value before committing to game.
Jacoby 2NT
Game-forcing major raise that asks opener to describe shortness and extra length.
Splinter Bids
Double-jump shifts showing a game-forcing raise with a singleton or void.
Multi 2♦
The multi-purpose 2♦ opening covering weak twos in either major.
Precision Club
The strong artificial 1♣ system used by world champions.
Puppet Stayman
Finds 5-card and 4-card major fits over strong notrump openings.
Transfer Lebensohl
Transfer-based variant of Lebensohl giving more bidding space.
Michaels Cuebid
Overcall in opener's suit to show a two-suited hand — both majors or a major plus a minor.
Checkback
2♣ is always the inquiry after opener rebids 1NT — finding major fits before placing the contract.