[jerdonald]

BBO forum,
I have been trying to find information about the Roman Gerber convention but
there's not much on the internet. Does anyone have a good source for it?

jerdonald

[jillybean]

I play Roman Keycard Gerber where;

4nt RKC Gerber
5C 1 or 4 aces
5D 3 or 0 aces
5H 2 with a minimum hand
5S 2 with a maximum hand

Is this what you were looking for?

[helene_t]

As Kathryn (Jillybean) says it may be Roman Keycard Gerber that you are looking for. Alternatively, it may be something like Roman Blackwood https://www.bridgebu..._blackwood.php. That would mean that the responses to 4♣ would be
4♦=0 or 3
4♥=1 or 4
4♠=one pointed ace (spade or diamond) and one rounded ace (heart or club)
4NT=two pointed aces OR two rounded aces

[jerdonald]

I am looking for what kind bidding sequences would lead up to using this bid.

The responses I found on the internet after the 4C bid were:
4D 0-3 Aces
4H 1 or 4 Aces
4S 2 Aces without extra values
4NT 2 Aces with extra values

jerdonald

[mw64ahw]

jerdonald, on 2021-July-21, 20:45, said:

I am looking for what kind bidding sequences would lead up to using this bid.

The responses I found on the internet after the 4C bid were:
4D 0-3 Aces
4H 1 or 4 Aces
4S 2 Aces without extra values
4NT 2 Aces with extra values

jerdonald

I interpret the extra values described above as relating to the lower or upper part of the NT opening bid range.

1NT-4♣ is a possible sequence, but any hand where opener typically ends up in 3NT and responder wants to investigate a NT slam either based on hcp or with a long suit and trick taking ability
There are also Gerberesque versions which show a king count instead of the extra values

[Gilithin]

Probably this.