1NT Response Forcing or Semi-forcing For One Round
Because the two-level responses are stronger than in Standard American bidding, the response of 1NT to 1♥ or 1♠ opening is forcing for one round and is used (among other things) for weaker hands containing low-ranking suits. Since the 1NT response is forcing, hands with a three-card limit raise can start with 1NT and later jump-support partner. See Forcing notrump for additional details. Some pairs play a variant in which the 1NT response to 1♥ or 1♠ is semi-forcing.
Read more about this topic: 2/1 Game Forcing
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