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Two Over One (2/1) Game Forcing is a natural, 5-card major bidding system. When the auction begins 1 / /, a simple 2-level response in a new suit is forcing to game. Responder promises 13+ points in the following 6 sequences: Opener. 1.
One appealing aspect of the 2/1system is that a large portion of the Standard American bidding system is identical to 2/1 bidding. You will need to modify your basic approach on a few bids – those where your partner opened in a higher-level suit than your suit with two-level response, as 1C – 2C.
There has been a strong trend, over the past 20+ years, to ever lighter openings, especially of a major, in a 2/1 context. This has been, on the whole, a good idea, reflected in its popularity. However, few ideas are perfect, and there are very real downsides to this trend.
2-over-1 is game-forcing as long as responder is not a passed hand and there is no interference bidding (so, in competition, 2/1 is NOT game forcing). The 2/1 Game Forcing system is really an outgrowth of Standard American and 5-card Majors and many of the methods and conventions employed are alike.
Your choice. A response on the 1-level is natural and of course forcing 1-round. A raise to 2 is natural (you can use inverted minors if you like--but that has nothing to do with 2/1 GF ).
2 over 1 (or write it Two over One, or 2/1) Game Force. As I said above, two over one is a strong system — it’s good enough for about half of those who win national championships in ACBL competition so you know it works — but more importantly, it is easy to learn (easier than standard American).
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Written with Eric Rodwell, a many-time world champion and top bridge theorist, this book takes you through all the steps of 2/1 Game Force, beginning with an introduction, then a look at the forcing 1NT response, then rebids by opener and responder and finally the choice between game and slam.
