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All comments by Nicolas Hammond
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I've updated http://www.detectingcheatinginbridge.com/statistics.html to include all data after Day 1 of the finals. For some reason BBO does not yet have segment 3 of the finals so that is not included.
Sept. 27
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They are a lot of fun. They brought a lot of energy to the events they played in. They entered some of the NABC+ events, including 2017 Reisinger.

The movie was sponsored by the ACBL Education Foundation. See https://www.acbleducationalfoundation.org/page/news-5/news/the-kids-table-movie-gets-cheery-reception-2.html

We must remember that this is their film of what they saw.
Sept. 27
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Here's the movie trailer: https://www.youtube.com/watch?v=hs_10C9p-FQ
Sept. 27
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After the opening lead, the statistics show the accuracy of the card played against double dummy. Any card that gives up a trick (double dummy) is a “bad” card, anything else is a “good” card. Percentages shown are good / (good + bad).

(1) “effective on defense” See above.
(2) “what counts as a mistake” See above.
(3) “who made mistake” Cannot determine. We know who played the card, but partner may have failed to signal properly.
(4) “difficulty of deal” All deals are treated the same.
(5) “ ”ineffectiveness in the auction". Not really. This statistic measures defensive ‘mistakes’. Separately I calculate (but haven't published) declarer ‘mistakes’. Declarers make more mistakes (ignoring the opening lead) than defenders.

The Law of Large Numbers should apply given sufficient number of cards played.

I fully understand that Bridge is a single dummy game and that these statistics are based on double dummy results.

Top players average in the 97.0%-98.0% range for played cards after the opening lead.

For the opening lead, the average (for an accurate lead) is ~ 81%.

I have the opening lead data (+ lots of other data) but don't show it on the web site. There are too few boards for opening lead comparisons to make meaningful sense.

The data is objective; the decisions on which statistics to show is subjective.

If there is some data you would like to see displayed, let me know and I'll see if I have it or can easily create it.
Sept. 27
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@David. You can scientifically break down Bridge into four categories: bidding, opening lead, defensive play, declarer play. You can further break down bidding into competitive and non-competitive auctions if needed. Butlers cover all four categories. The statistics I have published are just on the defense after the opening lead.

A problem with Butler is that it reflects who you played against. As an example, Morocco did very badly. If you were sitting out when your country played Morocco, your teammates would see their Butler scores increase.

The statistics I have published are objective data based on the pair's and player's performance. They are not a subjective opinion.

I do have separate stats on both bidding and opening leads but haven't published them.

The stats I have published only reflect one of the four categories in Bridge. But they are more reflective on how well the partnership did ignoring who their opponents were.
Sept. 26
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@Louis. Thanks. It is Bob not Bas. My mistake.
Data normalization is one of the hardest problems with BBO data. The BBO records listed “B Drijver”. I have to manually type in the mappings from BBO names to real names. There were 24 team, 6 players, 4 divisions, over 500 names to correct. I didn't do all of them, and got this one wrong. (There were a couple of others that were wrong that were privately caught earlier in the week). I had incorrectly entered Bas not Bob for “B Drijver”.
Sept. 26
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For those interested, I have been updating http://www.detectingcheatinginbridge.com/statistics.html after each day of play.
Sept. 25
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I have 138 boards for Chiaradia/D'Alelio on lead. Their error rate (bad lead according to double dummy) was 24.6%. Far higher than their contemporaries and today's players. If they were cheating on opening lead, they were not doing it very well.
Sept. 25
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@Richard. I have 39 deals with Roth declaring against the Italians. On 8 of them he made an “overtrick”, one or more than the contract. But this is not a good usage of the term in this context IMHO. For example 4+1 or 2+1 is an “overtrick”. Either way, I still rate Roth's claim as false.

Here's an example:
http://www.bridgebase.com/tools/handviewer.html?n=sK5hAQ76542dQ43c4&e=sA106h8dKJ875cAQ53&s=sQJ943hK103d10cK876&w=s872hJ9dA962cJ1092&d=W&nn=Tobias%20Stone&en=Pietro%20Forquet&sn=Al%20Roth&wn=Guglielmo%20Siniscalco&d=w&b=16&v=e&a=PP1D2SPPP&p=DA
At the other table:
http://www.bridgebase.com/tools/handviewer.html?n=sK5hAQ76542dQ43c4&e=sA106h8dKJ875cAQ53&s=sQJ943hK103d10cK876&w=s872hJ9dA962cJ1092&d=W&nn=Eugenio%20Chiaradia&en=John%20Crawford&sn=Massimo%20D%27Alelio&wn=B.%20Jay%20Becker&d=w&b=16&v=e&a=P1HX1SP2HP3HP4HPPP&p=D7
Sept. 25
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I devote ten pages about opening leads in my book. The range for top pairs (> 400 boards) is 15%-23%. Figures 50 and 51 from my book. The Italians are within the range. The graph follows a normal distribution. There are some outliers. I would not read anything into the statement about 16-21%. If anything, the pair that is at 21% is worse than average.
Sept. 25
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Top level players give up a trick on average 19% of the time on opening lead.

The Italians he played against are in the 16%-21% range.

I have Roth declaring 39 hands in the 1958 and 1967 Bermuda Bowl when playing against the Italians. In 6 of those boards, he made an “overtrick” (which I will define as one more than Double Dummy allows). Two of them were because of the opening lead; the other four came during the play of the hand.

Roth did not have the advantage of double dummy analysis and computers when he made his statement. These are his overtrick boards:

1958 (no play details)
Segment 6, boards 94, 99, 109
Segment 7, board 121


1967
http://www.bridgebase.com/tools/handviewer.html?n=sJ876h432dK104cA63&e=sAKhQJ96d2cKQ10974&s=sQ94hK10875dA93c85&w=s10532hAdQJ8765cJ2&d=S&nn=Giorgio%20Belladonna&en=Al%20Roth&sn=Walter%20Avarelli&wn=Bill%20Root&d=s&b=27&v=0&a=P2DP3NPPP&p=H7HAH2H6CJC3C4C5C2CAC7C8H4HQHKD5DAD6DTD2D3D7DKH9
http://www.bridgebase.com/tools/handviewer.html?n=s52hKJ10975d5cQJ97&e=s7hQ432dAJ32c10432&s=sK10963hAdKQ10986c6&w=sAQJ84h86d74cAK85&d=S&nn=Al%20Roth&en=Benito%20Garrozo&sn=Bill%20Root&wn=Pietro%20Forquet&d=s&b=91&v=0&a=1D1S3HPPP&p=S7S9SJS2H6H5H2HADKD7D5DAC2C6CKC7SAS5C3S3S4HJC4S6HKH3D6H8HTHQD8S8CTD9CAC9


Top players make an “overtrick” approximately 25% of the time.

Roth was only 15% against the Italians.

I rate Roth's claim as FALSE.
Sept. 24
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Sometimes there are assigned scores. 288 is a multiple of 16 (x 18). Just guessing as to reason.
Sept. 22
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I've published statistics from the Vugraph data for each pair on how they defended after the opening lead. This is a good test of how well the partnership is working on defense. See http://www.detectingcheatinginbridge.com/statistics.html. Only 33 pairs had enough boards (94) to qualify for the list. Moss/Lall ranked #31 of these 33 pairs.
Sept. 22
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I'm not sure about this one either:

“I played against the King of Bridge journalism”, Tom said regally.
Sept. 21
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Something like that.

The point was that Helgemo didn't play as well as he normally does.

However, statisticians will point out that there isn't enough data for true analysis.

I'm offering you both sides of the coin.
Sept. 20
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@Daivd: Familiarity. Laziness. Don't really like them (results presentation). I generally use Tor if I know I'll be searching for things I want to avoid ads on.
Sept. 18
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“I should be playing another game”, said Tom w(h)istfully.
Sept. 18
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@Espen: Full details of the drug(s) he was taking are posted at http://bridgewinners.com/article/view/anti-doping-violation-by-geir-helgemo-results-in-team-zimmerman-disqualification-from-orlando-rosenblum-cup/

WADA _requires_ all IFs to publish details on all failed tests. No privacy at all. If you agree to play in the main WBF events, you give up your medical privacy.

Helgemo was taking “Clomifene and synthetic Testosterone”. Clomiifene is often sold under the name “Clomid”.

There's a lot of discussion on the link I provide about what these drugs do along with a lot of inaccurate speculation.

The real reason why he was taking those drugs should be a private matter and should remain so; unfortunately it is semi-public knowledge, which makes this case even more tragic. Talk to a medical professional and they will explain what the combination is typically used for.

The WADA issue is that these drugs have been shown to improve certain performance. For example, see https://clinicaltrials.gov/ct2/show/NCT03028532

To oversimplify: “After a man reaches the age of 30 years, testosterone levels gradually decrease, falling an average of one percent each year.” (https://www.medicalnewstoday.com/articles/266749.php), Men start their andropause around age 30. For some men, this can present as a “mental fog”. Difficulty remembering things, lack of focus/concentration. Here is a sample site: https://evexiasmedical.com/andropause-may-affect-how-you-feel/.

The drugs listed can improve the “mental fog”, concentration issues of andropause.

Now that I've spent 30 minutes searching for some of the above on Google, I'm starting to get some very weird ads, so I suggest using Tor (the browser, not the player) to visit these URLs.
Sept. 17
Nicolas Hammond edited this comment Sept. 17
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@Espen: WADA provide a template for International Federations (IF). This makes logical sense. Each IF can then use those rules with minimal changes and without having to spend large sums and create a policy. It is logical for WBF to use this template. The fact that someone at WBF read the policy and added something specific for Bridge is a positive, not a negative. The rules are clearly defined for an individual or team in the WADA template. Someone added a rule to cover pair events.
Sept. 17
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