Examples
For example, on the sequence 1♣-1♠ (with our without opponent's interfering);1NT-2♣;2♦,2♥ will show an invitational hand with minimum five spades and four hearts, 2♠ an invitational hand with minimum five spades (in which case one does not have four hearts) or possibly six spades with or without four hearts. 2NT will show a balanced invitational hand, 3♣ typically an unbalanced invitational hand with club support. However, when one instead forces game with 2♦, opener will immediately start describing his own hand. He may, on basis of the aforementioned auction, with 2♦ being the only difference, bid 2♥ holding four hearts, 2♠ holding three card spade support, etc. Further bids are primarily natural.
Read more about this topic: XY Notrump Convention
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