Fundamental System: 2/1 à la BBO ================== 1NT Opening: 15-17 HCP, no 5-card major, no singleton, at most 1 doubleton. Does NOT promise stoppers in all suits. 2NT Opening: 20-21 HCP, no 5-card major, no singleton, at most 1 doubleton. Must have at least Kx STOPPER in all suits. 1C Opening: May be only 2 Club cards. May only be passed by partner if: a) opponents intervene; b) 5+ Clubs AND <6 points. 1D Opening: 4+ Diamonds, 12+ HCP. 2C Opening: Strongest bid. Responses: 2D < 6-7 HCP. 2H/2S/3C/3D = Ace of that suit. 2NT = 2 Kings or equivalent. 3NT = 2 Aces. A later bid of 4NT is asking for Kings. 2D/2H/2S: Weak. 6-card suit with 2 of top 3 honours or 3 of top 5 honours. If in 1st or 2nd position, NO other 4+ major suit. Hand is of no use in defence = other suits weak. Asking for Aces: 4NT. Responses are 30 / 41 / 2 5C 5D 5H 2/1 Theory: ========== a) No intervention from opponents: After an opening at 1 Level, ANY bid by partner at 1 Level is forcing for 1 Round. 1NT is forcing for 1 Round. Does NOT promise balanced hand. ANY bid in NEW SUIT by partner at 2 Level is forcing to game. Any response in partner's suit is limited. b) With intervention from opponents: 2/1 in CANCELLED. In particular: 1NT promises at least Kx stopper in opponent's suit.