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Vulnerable - A Vulnerable condition may occur on one, both, or neither side of the table, depending on the hand in a match.  In Rubber Bridge, the state where the side has won a singular game.  In Duplicate Bridge, the condition where the side will enjoy a higher game or slam score, but incur additional penalties for a failed contract. Vulnerable is sometimes referred to as the color "red".  Thus, "Red versus Red" means both sides are Vulnerable.

Vulnerability By Board -

North 1
None
5
N-S
9
E-W
13
All
17
None
21
N-S
25
E-W
29
All
33
None
East 2
N-S
6
E-W
10
All
14
None
18
N-S
22
E-W
26
All
30
None
34
N-S
South 3
E-W
7
All
11
None
15
N-S
19
E-W
23
All
27
None
31
N-S
35
E-W
West 4
All
8
None
12
N-S
16
E-W
20
All
24
None
28
N-S
32
E-W
36
All

For those so inclined, here is a memory aid to determine who is vulnerable on a given board - notice how the acronym letters rotate left for each four board round (the left most letter rotates to the right):

Boards Acronym Board
1 2 3 4
1 - 4 O N E B O = Zero North E/W Both
5 - 8 N E B O North E/W Both O = Zero
9 - 12 E B O N E/W Both O = Zero North
13 - 16 B O N E Both O = Zero North E/W

Jargon terms associated with Vulnerability -

Our Side Their Side General Slang U.S. Term. U.K. Term
Non-Vulnerable Non-Vulnerable Neither White vs White White
Vulnerable Non-Vulnerable Unfavorable Red vs White Red
Non-Vulnerable Vulnerable Favorable White vs Red Green
Vulnerable Vulnerable Horse and Horse Red vs Red Amber

 

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