What Does This Mean?

1. West	North	East	South
   Pass	Pass	Pass	1
   Pass	1	Pass	Pass
   1NT

   What's 1NT? How does it differ from double if they are similar?

2. You be the judge:

   AKxx Ax Axxx 10xx		Q KQJx KJx K8xxx

   West	East
   1	2 (game forcing)
   2NT (nat. 13-16*)	3 (natural)
   3	4
   4	4NT
   5	5
   6	Pass

   6 had no play and went down two. Ten tricks were available in notrump.

   1. apportion the blame.
   2. which was the single worst call?

   * Systemic notes: 1NT opening was 10-12. Rebids by West were "Kokish:" 2 = 5+, 2 = 4441, 2 = good club raise, 3 = bad club raise, 2NT = 13-16, 3NT = 17-18.

3. none vul, you hold  AK98 KJ832 xx Ax

   RHO	You	LHO	CHO
   1	1	Pass	Pass
   1NT*	All pass

   RHO thought a long time before 1NT.

   1. do you agree with your bidding?
   2. what do you lead?