Game of Knowns

The charm of Duplicate Bridge is that it is a game of imperfect information
- a game of unknown knowns. You commence a deal's auction knowing little
about pard's cards. But as the bidding and defence continues, the nature of
pard's cards are progressively revealed. Or alternatively you could take a
short cut by infracting the 2017 Law 16B1:

Any extraneous information from partner that might suggest a call or play
is unauthorized.  This includes remarks, questions, replies to questions,
unexpected alerts or failures to alert, unmistakable hesitation, unwonted
speed, special emphasis, tone, gesture, movement or mannerism.


(a)
A player may not choose a call or play that is demonstrably suggested over
 another by unauthorized information if the other call or play is a logical
alternative.


(b)
A logical alternative is an action that a significant proportion of the
class of players in question, using the methods of the partnership, would
seriously consider, and some might select.

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