BTU Namyats
BTU uses a 4X scheme that conveys ~0.58 more bits than traditional or Meckwell Namyats.
- 4♣: solid major suit without any outside A/K
- 4♦: semi-solid major suit with 0–1 outside A/K
- 4M: non-solid (1.5+ NLTC) major suit
| 4X- | PRE in 4M |
|---|---|
| 4NT! | RKCB |
| 5m! | CTRL ASK |
| 4X-5m | CTRL ASK |
|---|---|
| +1 | No CTRL |
| +2 | K or singleton |
| +3 | A or void |
| 4♣♦- | (S-)SOL PRE in 4M |
|---|---|
| 4♦! | (R) S/T |
| 4M!, 5M!, 6M! | P/C |
| 4♣-4♦ | (R) S/T |
|---|---|
| 4M | NAT MIN |
| 4NT! | MAX, CTRL in every side suit |
| 5♣! | MAX, no CTRL in ♣ |
| 5♦! | MAX, no CTRL in ♦ |
| 5M! | MAX, no CTRL in OM |
| 4♥- | PRE, non-SOL |
|---|---|
| 4♠ | S/O |