Natural (1NT)

Good, Better, Best recommends using conventional double over a strong notrump. We consider a natural notrump opening strong if at least half of the hands contain 15+ HCP. For instance, 14–16 is considered strong but 13–15 is not.

Over strong notrump

We play Woolsey, Multi-Landy with a conventional double, in all seats.

(1NT)-STR, usually 15+
X!CONST, 5+m, usually 4+M
2♣!UNBAL PRE, 4+♠, 4+♥, usually (54)(xx)
2♦!PRE, 6+M
2♥!PRE, 5+♥, 4+m
2♠!PRE, 5+♠, 4+m
2NT!UNT, 5+♦, 5+♣
(1NT)-X-CONST, 5+m, usually 4+M
2♣!P/C
2♦!Ask for the major suit

The other overcalls already correspond to preemptive openings in this book.

Over weak notrump

We play plain Landy against a weak notrump. This simple defense undermines their systems on approach over (1NT)-2♣. Meanwhile, we still threat to stop in our natural 2♦.

(1NT)-WEAK, usually 12–14
XPEN, 14+
2♣!UNBAL, 4+♠, 4+♥, usually (54)(xx)

By passed hand, we play the defense against a strong notrump.