Posted 2005-December-12, 15:50
We will assume they play 15-17 1NT *you didn't say*
We will assume WEST has at least five clubs and likely 4♦ for his fit jump (5-6 also possible I guess but unlikley he is to sell out with the with 6-5 come alive hand.. ) so lets call WEST 6-4 in the minors. Leaving him with three major cards. Since EAST will not have five or six hearts, two of WEST majors must be hearts. The last could be a spade or a heart, but with a spade void, he also might bid again.
Assuming for the problem the diamond King, if ACE is honest is with WEST. IF WEST had KQxx he would start an honor, So he has KT8x(x). We know about the club ACE-KING. If WEST lacked any major honor, EAST would be balanced 17 hcp. So WEST has either a heart honor or a spade honor. We don't know which. But we do know that it is safe to cash two hearts to find out what his heart holding is. Why, because EAST can not have either five or six hearts.
If WEST follows suit twice with small hearts, you know his only spade is the king. With SP-K, H-QJ, D-AQ, C-K East would open 1NT. If WEST follows heart low once, and then with a heart honor, you know the same thing (if east had both spade honors and one or more heart honor, he has a 1NT opener).
--Ben--