S 7632 W N E S H KQT8762 D - P(a) P(b) P(c) 1D(d) C 92 1S(e) P(f) 1NT(g) P(h) 2C(i) 3H(j) P P(k) S JT98 S K P H 3 H J54 D T92 D AQJ83 C AQJT6 C 8754 opening lead: SK(l) obvious shift: clubs(m) S AQ54 H A9 expert analysis: 9 or 10 tricks N-S, D K7654 depending on the C K3 opening lead. At notrump, 8 or 9.(a) [9 pts., 8 losers]
(b) [6 pts., 6 losers] The first pass denies an opening hand, and also, a suit good enough to preempt in.
(c) [10 pts., 8 losers]
(d) [16 pts., 5 losers]
(e) Four+ spades, 6 to 13 pts., often with length in opener's suit.
(f) The second pass denies a balanced hand of 9+ points or better, and it denies an unbalanced hand of 9+ points or better.
(g) ALERT! "Artificial and forcing, but not necessarily a good hand."
(h) A double here would show 2-3-5-3 distribution with an average+ opening bid, or 1-4-4-4 with extra values possible.
(i) ALERT! "Playable in clubs opposite a good 5-card suit. Not forcing."
(j) Finally, north describes a long heart suit, not good enough to bid previously. Note the preemption of E-W's diamond fit.
(k) Or, an aggressive 4H. At duplicate, prefer the pass with doubtful cover cards.
(l) Partner did bid spades...
(m) West carefully plays the nine under dummy's Ace, remembering that the jack or ten would ask for a diamond switch.