In this series, we are analyzing 1,000,000 deals which were played on-line. These deals cover a wide range of level of play and were provided by Stephen Pickett with Bridge Browser.

As this is the penultimate month of this feature, you might find it interesting to review the previous 10 articles. You can do so by clicking: https://www.larryco.com/BridgeArticles/  and clicking on One Million Deals.

Double & Redouble

What percent of final contracts were doubled (or redoubled)?

Approximately 1 in 8 contracts were doubled (or redoubled). Unfortunately, I don't have the breakdown of what the actual final contracts or levels were.

Also, I am curious to know how many of these contracts were sacrifices.  It would also be interesting to know how many of them made! 

I will work with Mr. Pickett to see if I can extract all of that additional information for a future article.

Of note is that slightly more contracts were doubled at matchpoint scoring than at IMP scoring. This makes sense to me, since players are (rightly so) reluctant to double partscores at team scoring. The exact numbers were as follows:

 
Percent of Doubled (or Redoubled) Contracts at IMPS:  12.87%

Percent of Doubled (or Redoubled) Contracts at Matchpoints:  14.18%