support in both majors Opener bids 4♣ with hearts and 4♦ with spades if the invitation is accepted. 4♣ response – asks Opener to bids the suit below his major. Opener bid 4♦ with hearts and 4♥ with spades. 4♦ response – asks Opener to bids his suit. 4♥/4♠ response – to play 2♥/2♠ openings Polish two−suiters, 6–11 HCP. Opening 2♥ = any 5-5 with hearts (spades possible) 2♠ response = pass or correct 2NT response – asks for another suit. With hearts and spades Opener bids 3♥. Other responses – natural Opening 2♠ = 5 spades and 5 of a minor 2NT opening 5-5 in minor, 6-11HCP. 3♥ asks to bid a longer minor or a longer major if minors are equal. 3♠ – natural, forcing 3NT opening Gambling (no stopper outside) 4♦ asks for singleton. Conventions in an uncontested auction Jump shift Strong, semi−solid suit, slam interest Fourth suit Invites to game after an initial one-over-one response. Responder may pass in the subsequent bidding but Opener may not. Fourth suit forces to game after a two-over-one response. Third suit If Opener raises the third suit, that promises four cards in the suit and denies a stopper in the unbid suit. 3NT bid by Opener shows four cards in the third suit and promises a stopper in the unbid suit. Forcing 2NT Responder's 2NT is forcing after a two-over-one response. Odwrotka After a 1♣ opening and a response in a major, 2♦ is Odwrotka (a "fit reverse"), that shows an 18+ hand, a fit, and asks responder to describe his hand. Jassem recommends replacing WJ2000's "Odwrotka" with the "Bubrotka" responses above. 2♣ – check back Weak with clubs or game invitational, or game forcing Opener's rebids: 2♦ = minimum opening, no 3-card support 2 in Responder's suit = minimum opening, 3-card support 2 in the other major = nice opening, 3-card support 2NT = nice opening, no 3-card support Responder's continuations: 3♣ signs off. 2 in the bid major is non-forcing (10–12 HCP). Other bids (including 2NT) are game forcing. En passant In an uncontested auction, stoppers are shown. In competition, bidding the opponent's suit asks for a stopper. If opponents bid two suits, bidding the higher-level suit promises stopper in the lower-level suit. Slam bidding Roman Key Card Blackwood 1430 5♣ = 1 or 4, 5♦ = 0 or 3, 5♥ = 2 or 5 no trump queen,