Posted 2005-June-26, 09:19
Two practical solutions before I will get to the answer to your question are, 1) try to use cue bidding and save RKCB to the right moment. 2) If both partners know slam is close one with void use Exclusion blackwood.
Ok, but here your partner takes you by surprise with Blackwood and yuo have an unexpected void. I like what Eddie Kantar suggest in his most excellent book on Roman Keycard Blackwood (yes, an entire book.... worht the money if you are a system nut).... It works like this...
If hearts are trumps,
4NT (rkcb)
------> 6C = one or three key cards, plus void in clubs
------> 6D = one or three key cards, plus void in diamonds
------> 6H = one or three key cards, plus void in spades
------> 5N = zero or two key cards, plus some void
------------> 6C ask which void?
----------------->6D = void in clubs or diamonds
----------------->6H = void in spades
When spades are trumps,
4NT (rkcb)
------> 6C = one or three key cards, plus void in clubs
------> 6D = one or three key cards, plus void in diamonds
------> 6H = one or three key cards, plus void in hearts
------> 5N = zero or two key cards, plus some void
------------> 6C ask which void?
----------------->6D = void in diamonds
----------------->6H = void in hearts
----------------->6H = void in spades
After the void is shown, if room exist, the next step bid by opener ask for trump queen. The thought on these auctions is from the bidding BEFORE blackwood is used, the blackwood asker will be able to determine if 1 or 3 or 0 or 2 keycards are held.
--Ben--