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All comments by Ante Mijić
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Hi both! First off all, congrats on all the accomplishmnets!. In your opinion, beside the obvious difference in quality, what is the biggest difference between playing in Junior and Open category?
Nov. 2
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I am afraid my hands are tied on this one. Tableau Public has some problems with adjusting to viewer's screen resolution, especially with textboxes. Making text bigger would result with some viewers not being able to read all of it. Therefore, it seemed better to make it smaller, since one really interested in it can read what one can see.
Oct. 31
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I did not analyze it so much to see if there was a penalty pass, so every passed double was assigned to the one that actually doubled.
Sept. 9
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You are exactly right. If the “11 HCP action” would apply only on the boards where on ALL tables 11-counters did not previously open, then 11 HCP open bar would be -1*11 HCP pass bar.

But when that's not the case, you have this. At some tables 11-HCP counters open and get in trouble. 11 HCP holders end up with a huge plus, but they are not plotted in the 11 HCP action dashboard because they did not get a chance to open their 11 HCP. Because of the Cross IMPs method, other tables are likely to be in minus whatever they score.
Aug. 29
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LW's total doubled contract defended: 8
LW's opps making doubled contracts: 2
LW's opps failing doubled contracts: 6
LW's total Cross IMPs after defending doubled contract: -1,33

Levin's total doubled contracts: 3
Opps making after Levin's double: 1
Opps failing after Levin's double: 2
Cross IMPs after Levin's double: +0,29

Weinstein's total doubled contracts: 5
Opps making after Weinstein's double: 1
Opps failing after Weinstein's double: 4
Cross IMPs after Weinstein's double: -1,62

Player 1 lives up to his name…
Aug. 27
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That “Pair profile” dashboard is just a title of the chapter, and dashboards after it are its content.
Aug. 25
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As long as Bobby opens they are fine
Aug. 25
Ante Mijić edited this comment Aug. 25
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Thank you, Martin!

I added the “Minimum No. of boards” filter. Setting it to a certain value (x) displays only the contract categories where boards are played x or more times.
Naturally, setting it to a value less than 2 will display all boards.

This filter was added at Played contracts and 1NT opening in Statistical overview part of the analysis. In Pair profile section and on other dashboards it just does not seem to make much sense.
Aug. 25
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The “Butler by days and rounds” dashbboard has been added.

Christian,I hope it helps with measuring the impact of playing (non)consecutive matches.
June 26
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Hi all,

I added “Coming back after a bad board” dashboard.

You can set what you consider to be a bad score (currently set as -10 butler score) and see how pair (or pairs) plays after it - against specific opponnent or in average.

Let me know your feedback or any ideas how to upgrade it!
June 26
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Hi Martin,

I am not sure how to parametrize iz, but I will sure give it a try and let you know what has come out of it.

Thank you for the advice - it does sound like an interesting metric!
June 24
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I don't know if you noticed or not, but I also added before and after lunch filters. I think that nutritional part of player preparation is neglected, at least on “non-pro” level.



More than a year ago our junior coach has come up with nutrition plan for before and during the Championship. I was highly sceptical about it and considered it to be “new age hype” sort of stuff. However, I am sure that following that plan has been one of the main reasons for being able to play the Championship without felling fatigue or lack of concentration.



I will try to add the filter “number of consecutive matches”, so it should be easy to see if the player performance drops after playing one round, then pausing the second one and playing the third one. Personally, to me it's the toughest possible schedule to play at.
June 21
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No, I really meant on Player corner dashboard. I made some adjustments on it now. It's the last dashboard of the whole work.

Select “All” for teams and pairs filter. hover over “Relative Butler” column header (at the far right) and click on sort button that is now displayed. You can sort it largest to smallest or smallest to largest, as you please.

The “Butler overview” dashboard was meant to be for one team at the time, to give the butler overview for each pair of the given team on the boards of different variance. It's not something to be used for all teams at the same time.

The whole work was made to fit on every screen automatically. Ideally, this should work like a charm. Should…let me know if you continue experiencing problems with the resolution.

Right now you can't download the source because I have made such setup. The dataset that I have is quite specific, and probably the hardest part of the job was to make the dataset functional for Tableau to work with it.
If you wish to see something in Excel format, such as list of all pairs and their relative butlers, send me an email with the requests and I would provide you with data.
June 20
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Cool stats!

Croatia has some funny stats too - we scored more VPs against top 8 teams then we did against teams ranked 17-24.


Btw, if the Championship matches were played on 10, 12 or 14 boards Israel would finish first (and with some fine margins), but on 16 board matches they have fallen to second place. I understand it's not an exact conclusion, but it's the fun way to look at it:)
June 20
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You can do this now, without countries and full names display. I can add the countries though, if that would be helpfull.

In Team and Pair filter choose “All” for both. Hover over “Relative Butler” column header (at the far right) and click on sort button that is now displayed. You can sort it largest to smallest or smallest to largest, as you please.
June 20
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Hi Christian!

Nice to see it actually helped someone.

I got to say that when I was doing it, the emphasis was on the certain points of the match. I wanted to observe where do the top teams make the biggest plus scores against lower ranked teams. Working theory was that it is in the last few boards, where lower ranked teams with unprepared players begin to lack focus, and higher ranked teams keep playing with same intensity. Although I was not able to find enough solid ground to prove this, your team's result on boards 10-16 is certainly something that made me think I was on the right path.

I may be completely wrong, but I do think that monitoring player performance at the start, the middle and the end of the match is something that's highly neglected. For example, if you knew a certain pair played 20 matches, and in average scored -1,4 butler on first three boards, wouldn't you advise them having some more prematch warm up, such as going through some interesting hands etc.? I would really like to hear your take on this, considering your NPC career.

There has been some discussion on the realtive butler in the old post, mostly regarding the method of its calculation. I think that whatever method is use to calculate it, relative butler is a superior measure compared to “normal” butler (calculated by averaging or cross-imps method), just beacuse it at least “scales” the IMPs you scored against an opponnent, and I don't think that +30 against a pair with average butler of -0,6 is the same as +30 against a pair with average butler of +0,6.
June 20
Ante Mijić edited this comment June 20
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I just saw your article and I was really impressed. Great work!

Sure, let's give it a go!
June 19
Ante Mijić edited this comment June 20
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Hi all,

thank you all for your feedback!

@Amnon, I agree with you. However, I tried adding the error bars and it just made the visualizations more complex. Given the fact that they are already complex to some extent, I decided not to include them permanently.

@Peter, it tends to get a bit complicated, but everything works as a filter on every chart. For example, in “Team profile” dashboard, setting the slider of rounds from 5 to 15 and opponent group at 1-8, will show results per board and butler scores from matches played in rounds 5-15 againts top 8 teams. If there are no such matches, all the charts will be empty. I understand it's not very usuall, but once you get used to it, it's quite a joy!
June 19
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It seems like a question for someone from the EBL TDs of the competition or someone from the organization.

Butler was sent to the team captains after each round, so maybe some of them would know better as well.


I can make a test though - compare the scores from three different methods of caluculation:

A) Butler with x% cut (made now, with x=25)
B) Butler without any cut
C) Cross IMPs

Will let you know when it's done!
June 19
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Hi Adam,

thank you for the feedback!

I agree that relative Butler can have some improvements, but this seems to be the best mix of simplicity and usefullness.


Each board has 32 scores made on it. When calculating the butler, four worst scores and four best scores are dismissed (8/32= 25%). After that the average score (based on the 24 scores left) is calculated and, with that average, butler for each pair is determined.


There are only 6 pairs that have played less than 10 rounds on the Championship. 2 of them played 2 rounds, one four rounds and three pairs have played 6 rounds.
I have hardcoded number 10 just because it seemed right (not that it has to be right, but it's less than 1/3 of the whole tournament). This number can also be set as a parameter, but it would add more complexity to filters, so I gave up on that. However, I don't think that even including all of them would made any difference, although I do agree that 10 round might be too harsh.
June 18
Ante Mijić edited this comment June 18
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