DEEP
FINESSE
A finesse when three or more cards are missing higher in rank than the card finessed. This deep finesse is often made in order to execute a Duck or Avoidance play, but can be a genuine play necessary to achieve the best result. Deep finesses have proven to have a greater mathematical percentage of success, than when the finesse is not taken. Several examples follow which illustrate the Deep Finesse.
Q105
West
East
632
A Deep Finesse is when South plays the 2, and finesses West with the 10. This finesse has proven to contain the highest percentage play. If West, however, plays to the trick with a low card, the percentage rate is higher of South taking the trick is if South plays the Queen.
AJ9
West
East
753
South leads the 3, West plays low, and the highest percentage play is for South to play the 9.
AQ9
West
East
642
South leads the 2, West plays low, and the highest percentage play is for South to again play the 9.
Although the following examples may not fit into the playing habits of most bridge players, a Deep Finesse is still mathematically the correct procedure to ensure the highest percentage play, when leading from a singleton.
In all of the above three examples, the percentage rate of success is highest if South, upon leading the singleton, deep-finesses with the 8 on the first round.Example 1:
AJ1085
West
East
6
Example 2:
KJ1083
West
East
4
Example 3:
QJ1084
West
East
5
If you wish to include this feature, or any other feature, of the game of bridge in your partnership agreement, then please make certain that the concept is understood by both partners. Be aware whether or not the feature is alertable or not and whether an announcement should or must be made. Check with the governing body and/or the bridge district and/or the bridge unit prior to the game to establish the guidelines applied. Please include the particular feature on your convention card in order that your opponents are also aware of this feature during the bidding process, since this information must be made known to them according to the Laws of Duplicate Contract Bridge. We do not always include the procedure regarding Alerts and/or Announcements, since these regulations are changed and revised during time by the governing body. It is our intention only to present the information as concisely and as accurately as possible.
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