 The one notrump opening denotes a balanced or semi-balanced hand with 12-14 HCP which can include a singleton or a five-card major suit.Opening one of a suit is natural but forcing, unlimited in strength that contains at least 14 high-card points (HCP).An exception is made for opening 1 or 1 with as little as 11 HCP when holding five cards in the bid suit and four cards in the other major.