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All comments by Louis Beauchet
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Yes Robert, you are correct. This is also the experience I've had with the Power Ratings.
7 minutes ago
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Michael: I totally agree with you that there is no way to measure a player's level perfectly using statistics. The Power Ratings are giving us a reasonable idea of a player's level of play, or scoring ability, that's the best we can ask for.

Someone with a rating of 58 isn't necessarily better than someone with a rating of 57, but someone with a rating of 60 is definitely expected to be better than someone with a rating of 55. So far, the Power Ratings have very seldom disappointed me when trying to evaluate a player's level of play.
an hour ago
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Richard: This is an interesting idea. Using the Power Ratings, I'm not sure it's possible to predict MP results board per board (or if it is, it's well beyond my intellectual abilities!), but it is possible to determine the “expected” MP score for each pair for the whole tournament.

Say there are 10 NS pairs. Pair number 1 has an average Power Rating (if that pair has a Pair Rating, it should be used) of 60. The average Power Rating of the other 9 pairs is 54. Pair number 1 is expected to score 60% in an “average” field with an average PR of 50 (equivalent to a DoD of 0). So with an average PR of 54 (DoD of 4), that pair is expected to score 56%.

If they score exactly 56%, their Ratings don't move, since they met their expectations. If they score more than 56%, their Ratings go up and vice-versa.
3 hours ago
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Kevin: “Fun” is indeed one good thing about those ratings. You don't need to play a lot and travel a lot to work on improving your Power Rating. If you are working full-time and can only play one night a week, or don't have the financial possibility to go to tournaments, you can still get a high rating, while you will never win a Mini-McKenney race.
4 hours ago
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The following tables may seem a little confusing at first, but show that Power Ratings are much more accurate than masterpoints in anticipating BOTH matchpoints and IMP results, like Michael said:
https://www.bridgepowerratings.com/WEBPAGES/URTEST.htm

This goes to show that not including IMP results in the Ratings is not a huge problem, since for the vast majority of players, their level at MPs is similar to their level at IMPs.

The “margin or error” is part of any statistical method, but Chris has done a great job developing a rating system for active players and regular partnerships that's as accurate as you can find right now. If anyone has ideas to make those ratings yet more accurate, I'm sure Chris would be thrilled to hear about them!
4 hours ago
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Jürgen: What I mean by “great” and “sound statistical basis” is that those Ratings are based on:
- your average matchpoint % over the past two years
- adjusted with the average Rating of your partners (you get more credit for scoring well with a low-rated player than with a high-rated player)
- adjusted with the strength of the field or DoD (you get more credit for scoring well in a strong field…)

I think this sounds like a pretty good and fair set of variables, but I would be happy to be proven wrong.

Obviously, numbers are just numbers, and the problems that I mentioned above are not necessarily easy to solve. But I think that the idea is great and if you are an active matchpoint player, you should have a very accurate rating.
6 hours ago
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Yes, you are correct Michael. On the old Flash version, it was possible to see a player's favorite convention card (if they had established one) simply by clicking on their profile. It doesn't seem to be possible anymore on the newer interface.
9 hours ago
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I think Chris is receiving online game files from the Common Game, so the clubs don't have to opt in individually.

As for the ACBL working on a rating system… this would be nice. I do think we need both an award and a rating system. Chris's Ratings are definitely great and have a sound statistical basis, so should definitely be used as a model by the ACBL. Of course, since IMP games don't count, some players who practically never play matchpoints don't have a Rating, despite being active in IMP games. There may also be a few people who are clearly better at one format or another (I don't know of many), so their Ratings are flawed if only based on matchpoints games. And finally, if a player's Rating is based on fewer than, say, 80 sessions or a player plays 80% of his games with the same partner, their Rating is going to be more volatile and less accurate. If your Rating is based on 80+ sessions with many different partners, ideally in different strengths of events, you can expect it to be within a point of your “real” bridge scoring potential.

The pair ratings are also an extremely valuable resource, and given the formula, more accurate than the individual Power Ratings. This is, as far as I can tell, the only way we have to measure the strength of regular partnerships, a key element in a game like ours!
11 hours ago
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It is visible both when playing and kibitzing. A nice feature, since you often get to see the “expert CC” when watching top players!
11 hours ago
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Elliot: Thank you very much for your lengthy and well-written reply. I read every single word with great interest.

Despite the numerous offensive comments that I received, I have no intention to change my mind and to become that camel in the oasis, UNLESS someone brings up new arguments that have a profound and meaningful effect on my current beliefs. That will happen. Life is a constant lesson. This is what I wrote to someone who PM me: “I'm aware that I'm nothing but a minuscule human being lost in the immensity of the universe with a very limited knowledge. That doesn't stop me from trying to understand what's going on around me, like many other human beings have done before me and will do after me.”

I will do my best to keep working on my rhetoric, so as to not appear defensive. I have a long way to go and appreciate your words of encouragement.
July 7
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Ray: I can't say I have been “looking” for Black contributors, but after several months going through BW threads every single day, I only remember seeing a picture of a Black contributor maybe once or twice at most. Of course, people who choose not to post their picture are entirely fine and no, you don't have to indicate your race on your account info!

My point was that most of the Black bridge players do not seem to be active on BW, making such discussions more difficult to have.

And yes, I agree with you that some topics are more delicate than others…
July 7
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I actually wish there would be more Black people on Bridge Winners. This would certainly make this discussion more interesting. I'm not even sure I ever saw a Black person on BW!
July 7
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This is actually surprising that this book hasn't been banished from libraries yet…
July 7
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To Amy, Jim & John: I couldn't have said it better, thank you. I have a feeling that Amy in particular may not agree with some of what I said, but at least she understands that there is not just one way of thinking. We are each entitled to think what we want. Only if our thoughts are to be transposed to violence, should “superior institutions” be interfering.

And to Daniel, if you think that I'm uneducated because I trust my experience more than your medias, good for you. All I can say is that I'm not looking forward to get educated, if that's what it implies!
July 7
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Yu: I forgot that there was worse than being a White man playing golf and bridge. There is being a straight White man playing golf and bridge.
July 7
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It's true that being a white man in 2020, playing golf and bridge, is the wrong profile to enter discussions on social matters…

Since you don't trust my experience living in Portland, maybe you will put more faith in my experience living in Atlanta, one of the “Blackest” towns in the country. What do you see in Atlanta? Black neighborhoods and White neighborhoods. Very few places where both races live together. And unlike here in Portland, there were countless examples of racist tensions in Atlanta, in both ways (both Black and White people were victims of racism from the other race).
July 7
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You are correct that I regard such people with some amount of disdain, because I do not relate to their vision of things at all. I thought I had justified my views well enough and didn't simply throw an insult out of nowhere.

I am trying to understand, but if now I'm accused of being a liar simply because I don't say “OK, you're right”, what can I say? You are not going to change my mind by accusing me of lying. Speaking of unconstructive dialogue, this is a great example.
July 7
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Yu: Thanks for the reply. A couple of things I would like to add. First of all, my affirmations did not end with question marks but reflect my beliefs. You don't have to agree, obviously. Freedom of opinion is still possible, fortunately! If you think my opinions are “arrogant”, it's totally up to you. All I want you to know is that they are based on thinking and logic on my part, not on a tantrum. Is my logic flawed? Maybe, and if experience teaches me to do so, I will gladly adjust my mind! Second, you are saying that you've met “at least one person” who was bothered by the term “master”. Is that enough, in your opinion, to banish it from our language and, in the current discussion, from the bridge language? It seems to me like most of those decisions are taken by following a very small minority, instead of following the majority, like in a democracy. There is no ideal political system that can please every single person. But we should at least thrive to please as many people as possible. Not restrict rights and force millions of people to change for the good of a few.

Richard: Having lived in Portland for nearly 6 years, I can assure you that this is a very liberal town and not a place where you will hear racist comments! Perhaps it still has the reputation of being a racist town, which is why it remains White, but this is not the case anymore. This is because of people like you who claim that it is a racist town that its reputation doesn't change. I would strongly encourage you to come visit the town and judge by yourself.
July 7
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Michael: Thanks for the additional info. I confess that I had never heard of that issue until a few weeks ago, so I'm glad you pointed that out.

Shawn: I'm trying to understand, but maybe you think that if I understand, then I'm supposed to agree…
July 7
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Thank you, John. Yes this world is crazy and incredibly difficult to understand. But that's also what makes our lives interesting! No matter what others think, I'm always looking forward to participating in discussions of all kinds.
July 7
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