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#1
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OHS event pairing rules
First Round
* note on random numbers:
Spoiler Alert!
0-loss and 1-loss tiers after the first round Sort the players by their Strength of Schedule.* While there are unpaired players in the tier: Select the unpaired player with the highest Strength of Schedule. This is player A. To find a match for that player:
* Strength of Schedule formulation:
Spoiler Alert!
Pair-up
2 and 3 loss tiers
Playoffs
Later-round rematch avoidance:
Initial MUs are 1A, 2B, 3C, 4D. Last edited by dok; May 31st, 2022 at 01:58 AM. |
#2
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Re: OHS event pairing rules
Any thoughts on implementing these rules for pair up/down for round 4 of the current event?
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#3
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Re: OHS event pairing rules
How about, any objections?
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#4
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Re: OHS event pairing rules
I finally looked at them close enough to give an opinion. Yes, I like. Good work.
There is nothing more dangerous than sincere ignorance and conscientious stupidity. --MLK |
#5
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Re: OHS event pairing rules
Well, it ended up not mattering this go-round, as there are 4 3-0 players and 8 2-1 players. But we'll go with these rules for future events, barring further announcements.
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#6
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Re: OHS event pairing rules
We've decided to change our Strength of Schedule metric, starting in season 15, as the current one arguably places too much emphasis on the more experienced opponents you've faced when calculating your strength of schedule. The new approach, instead of using inverse-variance weighting, will be derived by averaging the means and variances of all of your opponents, and backing out a ranking from there.
Last edited by MegaSilver; July 16th, 2014 at 09:00 PM. |
#7
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Re: OHS event pairing rules
Just a heads up that these rules will probably be changing next season. We have noticed some perverse effects in the way these SoS-based matchups play out, and more than one person has pointed it out.
We'll figure it out - we already have a basic sketch of a fix, just trying to figure out if it's the best way to go. If you want to chime in feel free. Last edited by dok; September 1st, 2014 at 12:34 AM. Reason: Alternative thread title: "dok's echo chamber" |
#8
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Re: OHS event pairing rules
Obviously this topic is quite meaningful to the community hence all the chatter, but alright I'll play along.
Quote:
It seems to me that the ranking systems have done what they were supposed to be doing. Those who get ahead on the SoS (almost always someone who pulled off 1-2 upsets in the first two rounds) gets matched up with the worst ranked of the lower SoS schedule. I always thought the problem with that is that it tends to do the same thing. The lower ranked players have high SoS and the higher ranked players have low SoS so they wind up getting matched up against each other anyway. One way around that I can think of is to solely reward the top player in SoS. (or at least give them primary priority) Everyone except the top SoS player gets ranked by their online ranking and the bottom player is matched up against top SoS. Then you repeat the process with those 2 players eliminated from the list. (so the 2nd ranked SoS gets matched up with the worst remaining ranking...unless the 2nd ranked SoS was already the worst ranked player and got matched up with the #1 SoS player. That means #3 SoS would get the lowest ranked player left....confused yet?) |
#9
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Re: OHS event pairing rules
Sorry to disappoint, but given that you've actually suggested one of the options I've put forward internally, I was able to follow it.
The issue arises when the top half SoS players in a tier all (or mostly) have lower rankings than the bottom half SoS players. When that happens, the pairings that round will actually serve to further exacerbate the SoS divide (because the high ranked, low SoS players get the weaker opponents, while the low ranked, high SoS players get stronger opponents). The approach you suggest gets rid of the worst case scenarios, but it doesn't solve everything. Example: One player has the highest SoS and ranking, and the next-highest SoS belongs to the player with the lowest ranking. While the #1 SoS player is rightfully rewarded with the easiest matchup, the next-highest player is now pushed into a matchup that will further ratchet up his high SoS. I've tossed out some other options that get rid of these sorts of corner cases, although they don't have quite the elegant simplicity of the approach you suggested. |
#10
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Re: OHS event pairing rules
Assign each player a rating based on performances against various opponents, weighted such that you gain more for beating stronger opponents, and lose more for losing to weaker opponents. Initiate a metric by using historical strength of schedule data. For each win, you gain (for instance) 10+x, where x=[some function based on the difference between your rating and your opponent's, and you can't gain <1 (hypothetically (rating difference)/10 or something)], and something similar for losing.
Maybe assign everyone the same rating, dated Jan. 1 2012 (or whenever is the earliest start date), and run the formula forward from there. So you had a 1600, like everyone else, on 1/1/12. Then on June 5, 2012, you beat Cap, who (like everyone) had a 1600 rating. You would get 10+x, where x=[(no rating difference)/10 = 0], so your rating would become 1610. Once everyone has a rating, maintaining such a system is easy. Ratings in hand, you then take each new tournament and lay out all the players in order by rating. In a tournament of 16, have 1 play 8, 2 play 9, and so on. After each round, sort by wins & losses within the tournament: 1-0, 3-1, whatever. As you already do. Within each category, sort (again) by rating. Then, of the 4 (hypothetically) players who are 2-1, have 1 play 3 and 2 play 4. Got it? And so on. New players will enter the system with a predetermined rating, which will go up or down quickly as their performance dictates. You can call this system the Universal Scaper Championship Formula. It'll work! And I invented it! |
#11
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Re: OHS event pairing rules
Quote:
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#12
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Re: OHS event pairing rules
Heh.
No, I had not. If you already have rankings, then adopting my suggestion for pairings is easy-peasy. I'd do it locally, but I wouldn't force rankings on my ftf buddies. Or their kids. Just abandon strength of schedule as a factor. Ratings are a substitute for it, for the purpose of pairings. The only reason why SoS is important to the FTF scene is because there aren't ratings in it. |
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