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Detail specifications 21BB - Level 2 ★
The Responder's first bid after a level 1 Major opening
Responses to a level 1 Major opening
1NT 'forcing' shows 6-12 HCP and doesn't give any other indication. Sometimes this is the only possible bid when you are not strong enough to shift to the 2-level
Jacoby 2NT. This is a very precise bid, 4+ trumps & 13+ support points.
RKC Blackwood 4NT. With a strong hand, to directly ask about the opener's key cards count.
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Problem E40042. Here is the famous Jacoby 2NT in response to a Major opening. It shows 13+ points and 4+ spades - game forcing!










You are not fitted and do not have 4 cards in ♠... Bid 1NT, round forcing.