Hi,
4D, a cue, denying a cue in clubs.
3NT showes 15-17 and a semi. bal. hand,
hence the partnership as 29-31 HCP and
a 9 card fit, hence you should make a move
toward slam, but not more.
If partner bids 4H, you have an easy pass,
since you told partner, that you have slam
interest, that you have a diamond control
and that you lack a club control.
With kind regards
Marlowe

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