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f. 1D – 2C Agreed by most 2/1 players as game forcing (at least 4 minor) 2) The responder makes a two level game forcing bid in a lower suit with 12+ “good” points. Thus, the 2/1 system requires a bidding mechanism to describe responder hands that have “in-between” values: those holdings in the 10-12 point range.
2/1 GF is by far the superior (and easier system). If teaching beginners, I would start out with 2/1 GF . Most bridge teachers agree with me. In "Standard," if your partner opens 1 and you respond, say, 2, it is natural and 10+.
An important part of the 2/1 GF system is to employ a 1NT bid (by an unpassed hand) in response to a major-suit opening bid as forcing (or semi-forcing) for one round. Unlike Standard American, this bid is not limited to 6 to 9 HCP. Normally, it shows 6 to 12 HCP.
2/1 game forcing (Two-over-one game forcing) is a bidding system in modern contract bridge structured around the following responses to a one-level opening bid: a non-jump response in a new suit at the one-level is constructive and forcing for one round, a non-jump response in a new suit at the two-level is forcing to game, and
Two-Over-One Bidding System (Overview) Agreements (May 22, 2021) Basic Opening Bids. 1♣ 3+ clubs 11*-18 points 1♦ 3+ diamonds 11*-18 points 1♥/1♠ 11*-18 points 5+ Majors - Reverse Bergen. 1NT 15-17 with Crawling Stayman 2♣ 19+ and artificial (Rule of 44)
The only real difference between the two systems is when responder bids at the 2 level over an opening bid of 1H or 1S. In the 2 Over 1 Game Force system, this establishes a game forcing auction. The partnership may not pass until a game contract is reached. This is the main principle upon which the system is based.
The 2/1 GF system is the same as Standard American except for a few differences: 1) A non-jump bid of 2 in a new suit after partner opens 1 of a major shows an opening hand and is forcing to game.
