Roman Gerber
A variation in responding to Gerber that will sometimes determine which ace is missing (when the partnership holds three aces.) The responses are:
4 |
shows 0 or 3 aces |
4 |
shows 1 or 4 aces |
4 |
shows 2 aces of the same color or adjacent in rank |
| 4NT | shows two other aces than for
4 |
See Roman Key-Card Gerber for a more popular variant.