You have opened the bidding and your beautiful partner bid a new suit on the two-level. This 2/1 response is forcing to game. Opener describes the shape of his hand. Extra strength can be shown later. Your options are as follows:
This is the crown jewel of the system. 2/1 (read Two-over-One) refers to responder’s first bid of a new suit on the two-level. In Standard American it shows 11+ points (or a good 10). Now, most of the bridge world plays it as a game-forcing bid, at least 13+ points (or a good 12). The advantage is simple: by telling the opener immediately that the hand is good enough for game, the partnership has plenty of room to explore the best contract without jumping needlessly. Note: Game level is defined as 3 NT or 4 of a suit. If your trump suit is a minor, you are not forced all the way to 5♣ or 5♦. Even if you've made a 2-over-1 response, your auction can end at 4♣ or 4♦ if that's your agreed suit.