Roth-Stone Astro
A variation of the Astro convention. After a 1NT opening by the enemy, the responses are:| Double | shows hearts and spades |
2 |
shows clubs and spades |
2 |
shows diamonds and spades |
2 or
2 |
shows that suit |
| 2NT | shows clubs and diamonds; |
| 3 |
shows clubs and hearts; |
| 3 |
shows diamonds and hearts. |