helene_t:
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By the way, how many dots do I get for playing 1NT as any weak one-suiter?
I forgot to write about this in my initial post. An artificial 1NT call, which isn't covered by the rules about suit pointers etc which takes precedence, gets 2 dots unless weak. If also weak it gets 3 dots. A bid counts as weak if it can contain less than 8 hcp. So 1NT 6-9 with 6+ cards in any suit gets 3 dots. 1NT 8-11 with 6+ cards in any suit gets 2 dots.
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What about defence against strong or otherwise strange passes?
An artificial pass is considered as an opening bid. This means that if the opponents open with an artificial pass you may play whatever you want after such a call. A pass is considered artificial if it may contain more than 13 hcp or if it doesn't contain all weak hands (less than 8 hcp) with 4333 distribution. Examples:
Pass = 0-7 hcp or 17+ is artificial
Pass = 0-13 hcp is natural
Pass = 0-14 hcp is artificial
Pass = 0-5 hcp or 10-13 hcp is natural
Pass = 0-11 hcp, but not 4333 and 7 hcp (lets say you play mini-NT showing 7-10 hcp), is artificial