comprendre les points

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sephdar
Posts: 8
Joined: 01 February 2017, 14:55

comprendre les points

Post by sephdar » 13 July 2019, 17:25

bonjour
Je croyais que les points étaient attribués selon le niveau des joueurs de la partie :
un plus faible battant un plus fort gagne plus de points que si c'est le plus fort qui bat le plus faible.

or je viens de faire une partie de "6 qui prend" et je suis surpris par l'attribution des points
pourquoi celui qui arrive 2e et qui a un ELO plus fort que le 1er gagne-t-il plus de points ?
1er : 150 + 27 = 177
2e : 165 + 49 = 214

pouvez-vous m'expliquer? merci d'avance
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souly4
Posts: 83
Joined: 06 January 2018, 06:02

Re: comprendre les points

Post by souly4 » 13 July 2019, 19:41

There is nothing mysterious going on, this question has been posed several times in the forum. The explanation is simply that for 'new' players in a game (under 20 games total) a higher K-factor is utilized.

Normally, when you have over 20 games, the K-factor will be at 20 permanently.
But to accommodate for the fact that we don't know the actual skill of players with 0 games in a game, the usual ELO calculation is multiplied in order to reflect that skill more quickly (i.e. to take less time to let the ELO commute in the appropriate range).

It only applies to the first 20 games though like mentioned, and the other players involved don't suddenly lose more points (so the ELO sum can be unequal zero in such cases). The K-factor in first 10 games is 40, in games 10-20 it's 30. This means, compared to K-factor 20 after, the ELO gain/loss would be multiplied by 2 or 1.5 respectively.

You can also retrace every new ELO assessment if you hover over one player's score on the result page. Like this (second row, K-factor = 30):
https://www.bilder-upload.eu/bild-5c7b4 ... 3.jpg.html

For more info about K-factor, there are enough threads. For example:
https://boardgamearena.com/forum/viewto ... t=k+factor
https://boardgamearena.com/forum/viewto ... t=k+factor

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