[BUG] ELO calculation

[petyr]

In the game 2347 ( http://boiteajeux.net/jeux/myk/partie.php?id=2347 ) all players gained negative ELO (I see them in the final email) - how is this possible?

[Xo]

Hi Petyr
The curse of the mummy you have disturbed, I think

More seriously, can you please post the email content, with the loss per player ?
It sounds like a bug, the sum of the elo gain/loss should be (more or less) 0

[lynkowsky]

We allready saw this bug : as 1 player was unrated (replacement), this was a 3 players game for rating :
- 2 strong players draw first
- weak player 3rd.

[petyr]

Yes, it's exactly as lynkowsky said (baratzanthatul was a replacing player):

Game #2347 is over!
Winner(s) : Arkonys, Sebos77

1. Arkonys [ELO -3] (1747 --> 1744)
1. Sebos77 [ELO -1] (1728 --> 1727)
3. baratzanthatul [ELO +0] (1468 --> 1468)
4. petyr [ELO -2] (1286 --> 1284)

[flogae]

Can anyone publish the ELO formula that is used here at BAJ?