With a trump suit agreed, cue-bidding engaged, TURBO arrives!
The exception is that TURBO is NEVER used following a 2 opening bid.
In the 2
scenario we have the stronger hand interrogating the weaker from start
to finish! - However leading up to TURBO the partnership exchange cue bids on
an equal footing, then TURBO checks controls at 4NT. It
would be a incorrect to mix cue-bidding leading to TURBO with other
sequences leading which lead to 4NT ERKCB style or 4NT for Kings which
specifically follows a 2C opening.
advantage of TURBO is that one partner gets to know the partnerships
key controls (RKCB+) as 4NT is bid or passed by and cue bidding continues!
(E)RKCB key cards are only determined when a 5-level response to 4NT is
given and that would automatically discontinue cue-bidding.
So, you're cue-bidding (see the rules!) and you're approaching the 4NT zone!
Just like with (E)RKCB, a TURBO 4NT is just about all Relevant Key Cards (RKC) -The relevant aces & kings. Read on...
The essence of TURBO lies in the following statements:
So in the third
rule above, without the Queen of trumps you need to bid Game in the agreed
suit - not cue bid above it. This bid is neither FORCING nor a command
to end the bidding - that's entirely up to your partner.
- Actually bidding 4NT shows an EVEN (2 or 4) number of Relevant Key Cards(RKC)
- A RKC may be a K of any suit opposite a disclosure of lacking a 1st or 2nd round control
- By passing 4NT shows an ODD number of RKC (3 or 5)
more little rule: one must not pass 5 of the agreed minor suit or 4 of
an agreed Major suit without holding the Queen of trumps!
- One should not embark on cue bidding without at least 2 KC!
When a minor is the agreed suit, when holding the Queen of trumps you
may pass by the game level when (a) you're comfortable to continue to a
slam (b) have a further
control to announce. Therefore if partner now continues after you bid
game it neither shows or denies the Queen of trumps BUT it does show
slam intent and he is aware his partner does not possess the Queen of Trumps.
When the agreed suit is a major we are not passing game in the major
without the Queen. This is quite a useful as it ascertains the Queen of
game level. This allows cue bidding to proceed right up
to game without fear of getting too high when the Queen is vital.
Nothing stops partner from progressing further towards a slam knowing
the Queen of trumps is missing.
So we must emphasise that cue-bidding on this scale needs strict
adherence to cue-bidding rules so that both partners have the same
understanding of the auction.
TURBO takes a little effort to master, but i'm sure once it is well
understood, it would always be the route to bid good slams (even thin
ones) and equally to avoid bad slams. It also adds clarity on whether
to go on to the grand! Most importantly of all it uses less bidding space then any Blackwood variant.
There are 3 situations where Spades¦Hearts fit & game values are
agreed by the 3-level: (Classical TURBO does not cater for minor suit
3NT TURBO bids, however in Beta it is possible following
the last sequence given below.)
2Ma - 2NT - 3¦¦ -? 1X - 2¦ - positive - ? & 1NT - 3¦ - 2steps - ? these 6 sequences will have positive responses under 3NT.
Now 3NT is TURBO showing an EVEN number of Key cards while making a cue
bid past 3NT shows an ODD number of key cards. This is a useful tool to
decide on the possible final level bidding bidding can reach.
Only in the case of 1NT - 3¦
where technically a 6-2 fit is already guaranteed (although it my only
be a small doubleton), so we may consider the following: combining both
turbo & trump request responses:- use 3NT directly with 0 or 2 KC
and with 1 or 3 KC show the trump request responses directly with 3¦¦¦. Then after 3NT showing 0 or 2KC use 3 as a further relay to remake the trump request. Responses will then be 3¦¦¦NT.
After 1X - 2¦ - 2¦NT(negative responses) - then positive response for X: & TURBO