System name: Ed&Marion
Author: Ed Paterson
Created on: December 9th 2025 at 13.05
Last modified on: December 9th 2025 at 13.05
- 1♣: 11+ with 4+♣.♮♭
- 1♦: 6+ with 4+♦.♮♯
- 1♥: 11+ with 5+♣ and 4+♥.♮♭
- 1♦: 6+ with 4+♦.♮♯
- 1♦: 11+ with 4+♦.♮♭
Example system.
| ✶ | artificial |
| ♮ | natural |
| 𝄫 | sign-off |
| ♭ | non-forcing |
| ♯ | forcing |
| ? | game invitational |
| ! | slam invitational |
| † | game forcing |
| ‡ | slam forcing |