Percentage Objection

Dealer: South
Vuln: Love All
Scoring: Rubber

  1. spadeA K Q
  2. heartK J
  3. diamondA K 7 6 3
  4. clubK 5 4
  1. spadeJ 10 2
  2. heart10 8 3
  3. diamondQ J
  4. clubQ 10 8 7 2
club diamond heart spade NT
N 3 4 - 6 5
S 3 4 - 6 -
E - - 4 - -
W - - 4 - -
Green square in centre
  1. spade
  2. heartA Q 9 7 6 5 4 2
  3. diamond10 9 8 2
  4. clubJ

Contract: 6spade
Declarer: South
Lead: diamondQ

  1. spade9 8 7 6 5 4 3
  2. heart
  3. diamond5 4
  4. clubA 9 6 3
Double dummy analyser: makeable contracts
West North East South
3spade
Pass 6spade Pass Pass
Pass
Working on general principles for the more discerning declarer, I suspect any small mathematical difference could be overturned by the slightest awareness of the defenders strengths or weaknesses.

On this particular hand, imagine that you took the alternative line of winning at trick one and eventually ducking a club to East. How would you react if he exited with the 9heart? If you know East is a weak player, then the heartA is definitely with West, whereas if he is strong that conclusion is not available. Why? Because a strong East would realise that you'd be bonkers to play like this if you had a heart loser. Knowing himself to be end-played, he would lead away from his heartA, rather than trying to cash it.
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