please join me a écrit :My ELO in Trajan is 2073 and I just defeated someone with an ELO of 1617, but didn't gain any ELO points. I have nothing to gain, but lots to lose? How do I know exactly how low to set my bracket minimum when setting up a new game in the waiting room, as to make sure I will gain at least some points if I win?

I'm not surprised since I think that, with an Elo gap of +456 (2073 - 1617), you are likely to win 1 point at best for any victory, and most probably 0 through the rounding algorithm...

In

a 5-years old dedicated post (the title can be translated as "

Modification in the Elo calculation"), unfortunately written in French, Diplojak writes (excerpts from 3 different coms) :

Diplojak a écrit :... C'est un calcul elo classique, le même qui était utilisé aux échecs en France avant le calcul FIDE. C'est juste un peu long à détailler. ...

... [Un joueur d'Elo 1500 bat un joueur d'Elo 1400] : en gros, pour modifier l'Elo pour une partie à 2, on donne a l'Elo actuel un poids 15, et à la perf[ormance] [*] liée à la victoire (qui vaut dans cet exemple quelque chose comme 1800) un poids de 1 : ((1500 x 15) + (1800 x 1)) / 16 = 1519 ...

... Les points gagnés, pondération ou pas, x joueurs ou pas, tendent vers 0 si l'écart [**] se rapproche de 400 points...

Translation (hopefully correct) :

... It's a classical Elo calculation, the same that was used in France for chess tournaments (by FFE, French Chess Federation) before the FIDE formula (= WCF, World Chess Federation). That's just a bit long to be detailed here ...

... A player ranked Elo 1500 beats a player ranked 1400 : roughly, to modify the Elo in a 2-players game, you give the current Elo a weight of 15, and to the gain [*] linked to victory (evaluated to something like 1800 in this example) a weight of 1 : ((1500 x 15) + (1800 x 1)) / 16 = 1519 ...

... the points you win, using a ponderation or not, and whichever the number of players is, tends towards 0 when the gap [**] gets closer to 400 points ...

[*] FR: performance / EN: gain : my understanding about this "gain" value is roughly your opponent's Elo + 400 in this case : 1400 + 400 =1800.

[**] FR: écart / EN: gap : my understanding is that this "gap" refers to the difference between both players Elo's : thus reaching 400 (and even worse exceeding 400) means you have little chance --

if any-- of winning 1 single Elo point...

Conclusion: YES, in that kind of game, you have nothing to win but lots to lose...

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