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#73841: "Groups Stage tournaments ought to assign players by the serpentine system"
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When I recently created a Groups Stage tournament with five groups (boardgamearena.com/tournament?id=166397), I was surprised to see the groups assigned according to ELO ranking using this "typewriter" method:
GROUP 1: players ranked #1, #6, #11, #16, #21, #26, #31, #36, #41, #46
GROUP 2: players ranked #2, #7, #12, #17, #22, #27, #32, #37, #42
GROUP 3: players ranked #3, #8, #13, #18, #23, #28, #33, #38, #43
GROUP 4: players ranked #4, #9, #14, #19, #24, #29, #34, #39, #44
GROUP 5: players ranked #5, #10, #15, #20, #25, #30, #35, #40, #45.
I call this the typewriter method because after the first "line" of 5 players is assigned to groups 1 to 5, we go back to group 1 before assigning the next "line" (players #6 through #10).
This system is flawed because players in Group 5 have much softer competition than players in Group 1. It makes sense to put the top 5 players in 5 different groups (to give them a measure of "protection" from each other) but on that logic player #1 should face the *softest* competition, not the toughest.
Instead, groups should be assigned by a snake system; Wikipedia labels this a serpentine system: en.wikipedia.org/wiki/Serpentine_system
Player #6 should be in the same group as #5; #7 should be in the same group as #4; and so on. That way the seeds are meaningful, with every player facing (in theory) competition that is a little bit softer than the next-seeded player. (For example, player #4 faces softer competition than #5, who faces softer competition than #6.)
Discussed briefly in the forums last year: boardgamearena.com/forum/viewtopic.php?p=88637#p88637• 你的瀏覽器是什麼?
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2022年10月15日 9:35 •
BananaHarambe • 開發者尚未重現這項錯誤:
2024年11月20日 2:46 • I agree that the Serpentine system should be implemented for setting up group stage tournaments so that each group has roughly the same average skill level.
How does the Serpentine system handle an uneven number of players? Current system is basic "typewriter" like you said so my most recent double RR tournament had 2 extra players, 41st and 42nd rated with 8 groups that were assigned to group 1 and group 2. So we had 2 groups of 6 and 6 groups of 5.
With Serpentine System I assume it would just add them to groups in order using the "snake" algorithm so they would have been placed in groups 8 and 7 with the snake going backwards since each group has 5 people prior to the last 2 people.
How does the Serpentine system handle an uneven number of players? Current system is basic "typewriter" like you said so my most recent double RR tournament had 2 extra players, 41st and 42nd rated with 8 groups that were assigned to group 1 and group 2. So we had 2 groups of 6 and 6 groups of 5.
With Serpentine System I assume it would just add them to groups in order using the "snake" algorithm so they would have been placed in groups 8 and 7 with the snake going backwards since each group has 5 people prior to the last 2 people.
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