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Instead of asking for aces, as in traditional 'Blackwood', with RKCB you ask for key
cards
which are the four aces plus the king of trumps.
Obviously the trump suit must have been agreed earlier inthe
auction.
If there is no agreed trump suit, (e.g. 1 - 2 -
3NT - 4NT ) then simple 'Blackwood responses are
used.
When a trump suit is agreed (e.g. 1 - 2
- 4NT fixes hearts as trumps) 'RKCBlackwood
responses are used.
| RKCB
asking for key cards |
| 4NT |
5 |
0
or 3 key cards |
1
or 4 |
5 |
1 or 4 |
0 or
3 |
| 5 |
2 or 5 without
queen of trumps |
2 or 5
without queen of trumps |
| 5 |
2
or 5 with queen of trumps |
2 or 5
with queen of trumps |
After
the reply to 4NT, 5 of the trump suit is a signoff.
If the reply
is 5 or 5,the cheapest relay asks for the trump
queen.
(Next suit says no. One suit higher says yes.)
Blackwood 5NT, asks for kings, but obviously do not include the
trump king if you have already shown it.
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Additionally
(with partnership understanding):: |
|
A
5NT response to 4NT can show 0 or 2 key cards with a working void |
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6
of any suit below the trump suit can show 1 or 3 key
cards with void in the bid suit |
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6
of the agreed trump suit can show 1 or 3 key cards with
a void in a higher ranking suit |
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