Against NT
Lionel against strong NT, Lionel if passed hand, Astro against strong NT.
Strategy
We define the range of NT include 16 or above as Strong NT. For example: 14~16, 15~17, 16~18, etc.
For the range of NT below 15 as Weak NT. For example: 10~12, 11~13, 12~14, 13~15, etc.
Lionel
(1N) - ??
Dbl
10+, ♠+any suit.
2M
6+M. (2N=Ogust, raise=constructive)
2N
♦+♣, 11 cards in two suits.
After (1N)-2M-2N, overcaller should bid 3x with a weak two hand, and jump to game with a full opening hand.
Astro
(1N) - ??
Dbl
14+, partner can pass
2♣
10+, ♥+any suit
2♦
10+, ♠+any suit
2M
6+M
2N
Very good hand, two touching suit 6-5. ♠+♥ or ♥+♦ or ♦+♣ or ♠+♣