#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 • Jaký prohlížeč používáte?
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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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