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Detail specifications 63EZ - Level 1

Blackwood or Quantative 4NT?

Blackwood or Quantative 4NT?
If a support fit has already been established, 4NT is always Blackwood. However, if a fit hasn't yet been established, sometimes you need to stop and think!
  • Certain bids specifically imply a fit : Splinter, a jump fit and especially a Texas rectification jump bid, so when 4NT is bid this is Blackwood..
  • After a 1C0 opening bid and a fit hasn't yet been established and your P bids 4NT ... this is Blackwood. Your P is fitted and doesn't want to give the Opps bidding space to find a "sack" contract.
  • In certain bidding sequences, your P doesn't have the bidding space for a forcing Slam bid, when he bids 4NT this is Blackwood and implies a support fit.

SWNE
1 Pique Pass 2 Trefle Pass
3 Pique Pass 4 SA Pass
5 Trefle
Ace Spades
King Spades
Queen Spades
10 Spades
7 Spades
4 Spades
Ace Hearts
Jack Hearts
9 Hearts
Jack Clubs
9 Clubs
4 Clubs
3 Diamonds
Exercise E9761 5 using 30-41. P doesn't have any bidding space for a forcing support bid... This is Blackwood.
 
SWNE
1 Coeur Pass 4 SA Pass
5 Coeur
Queen Spades
Jack Spades
8 Spades
Ace Hearts
Queen Hearts
9 Hearts
7 Hearts
4 Hearts
6 Clubs
5 Clubs
Ace Diamonds
9 Diamonds
6 Diamonds
Exercise E9764 5 using 30-41. P doesn't want Opps to find a contract. It's important to bid Blackwood directly when it's a lower ranked suit.
 
 
Blackwood or Quantitative 4NT?
The following 4NT bids aren't never Blackwood :
  • After a Stayman or a Texas bid and no established fit, 4NT is always quantitative.
  • After a NT Game invitation, 4NT is always quantative.

Ace Spades
Jack Spades
Ace Hearts
8 Hearts
5 Hearts
3 Hearts
Ace Clubs
Jack Clubs
9 Clubs
Queen Diamonds
10 Diamonds
4 Diamonds
2 Diamonds
SWNE
1 SA Pass 2 Trefle Pass
2 Carreau Pass 4 SA Pass
6 Carreau
6 Spades
4 Spades
3 Spades
King Hearts
7 Hearts
King Clubs
Queen Clubs
10 Clubs
Ace Diamonds
King Diamonds
Jack Diamonds
9 Diamonds
8 Diamonds
Exercise E6006 After a Stayman bid with an established fit, 4NT is a quantative bid.
 
King Spades
8 Spades
3 Spades
Ace Hearts
Queen Hearts
10 Hearts
9 Hearts
8 Hearts
King Clubs
5 Clubs
King Diamonds
9 Diamonds
7 Diamonds
SWNE
1 SA Pass 2 Carreau Pass
2 Coeur Pass 4 SA Pass
6 Coeur
Ace Spades
7 Spades
5 Spades
4 Spades
King Hearts
Jack Hearts
7 Hearts
Ace Clubs
8 Clubs
6 Clubs
4 Clubs
Ace Diamonds
8 Diamonds
Exercise E6031 After a NT Game invitation, 4NT is a quantative bid.