| All Vulnerable, what should I do when the bidding goes: 
    1S - (3H) - ? 
 Holding:  K x x x x   x   Q x x   x x 
    x x
 
 Based on your 
    proficiency, perhaps you are viewing this hand in terms of the
    Law of Total Tricks,
    Losing Trick Count and 
    associated cover cards (see 
    Hand 
    Evaluation Books).  Apparently your Right Hand Opponent has 
    judged a score of 500 works better than your 620, or at least would like to 
    give you that impression. But looking 
    at your hand, it's clear both you and Left Hand Opponent have surprises.   
    On a good day (like this one), LHO may even want to push their side to 5 
    Hearts.  Cuebidding 4H by you would be too forward going, 
    showing extra values, first round control, and slam interest so we can 
    immediately can rule it out. The only question is what level of Spades.  Considering 
    your Heart singleton, you might anticipate LHO is can support Hearts.  
    Thus, if you bid 3S, I suspect LHOs will fire down their 4H 
    response.   If partner doubles, what next?  Belatedly pulling 
    to 4S would be anti-partnership - the worst evil. So with 11 trumps 
    total and neutral vulnerability, it's important that you bid game right now.
     Now then, 
    let's look at the hand from another perspective. You have 8.5 Losing Trick 
    Count.  But as responder, you should instead focus on controls:  
    2+ here (SK plus 1+ for singleton). Thus, slam appears distant.  Since 
    partner didn't open with a strong 2C, partner has at most 5 LTC.  
    So your 2+ controls  stretches your side to a maximum 2-3 LTC: quite 
    likely making game with a bit of reserve left over.
 Enough talk: 
    let's look at the results of a simulation. 
 North: 5+ Spades, 12-21 points
 East:   7-8 Hearts, 0-2 Spades, 5-11 points, 2+ Heart honors
 South:  actual hand above
 West:  any random deal
 Run:    500,000 hands with 100 meeting criteria
 Results:  
      
        | Tricks | 8 | 9 | 10 | 11 | 12 | 13 |  
        | 4S | 97% | 82% | 54% | 26% | 8% | 1% |  
        | 4H | 99% | 92% | 78% | 55% | 18% | 2% |  So the Law of 
    Total Tricks again prevails (with neutral vulnerability, bid to the level of your total aggregate tricks).  Taking a second
 look at your hand, you can clearly see it has no defensive values.
 Without 
    looking at specific hands, note from the data above that opponents' have twice the likelihood as your side making a given level 
    contract.   Of course, our partner and LHO would make a better 
    assessment on case by case basis.
 In summary, I 
    recommend bidding 4S. There is no reason to preemptively bid 5S, 
    particularly when 4S has a good play. Fortunately, you didn't ask 
    what to do if LHO bids 5H and partner passes!  But remember 
    Larry Cohen's immortal words: 
 The 5 level belongs to the opponents'
 If that 
    doesn't work out, ask Larry for a refund! |