Tramticket, on 2024-December-03, 03:00, said:
What does FSF followed by 3♠ show? Presumably it is four spades rather than three spades prepared to play in a Moysian? And it shows a hand too strong to raise spades by any other route? What options did partner have to raise spades?
But assuming it is very strong with four spades, we can't do less than cue-bid 4♣, although this might not be particularly helpful if we get a 4♦ cue bid in return.
The practical bid is probably to ask for key cards with 4NT.
Yes, it is a game force with (at least) four spades. Partner also had a simple raise (2
♠), invitational raise (3
♠), preemptive shape-raise (4
♠), diamond splinter (4
♦) and non-raises available. Partner did not have a way to splinter in clubs. 3
♦ is undiscussed and therefore does not exist.
awm, on 2024-December-03, 03:05, said:
It is a nice treatment to reverse 2♠ and 3♣ by opener here; the 5-6 hand is rare and this allows responder to agree clubs at the three level instead of being forced to decide whether to bypass 3nt.
I agree, and more generally think there is room for improvement on 4SGF auctions by utilising a low bid as the punt, even if this requires artificiality. Unfortunately we do not play this.