3♦, 3♥ and 3♠ are all initially investigations of the best game. 3D: Only a single diamond stop, nothing to emphasise in the majors 3H: Good hearts 3♠: Hx 3NT: To play, probably with a double diamond stop 4♣: Confirms clubs as trumps and initiates a cue-bidding sequence This is how I would also interpret it. Though with Hx of spades and a single diamond stop my style is to also bid 2S over the 4sGF. On the actual hand, we certainly have great cards for a club slam so I will slow it down with 3D to investigate further.