“The number of Elo points you can gain/lose during a game increases with the number of players. The maximum is reached when there is the “recommended number of players”. Try to play games with this recommended number of players”.
Chance of winning:
In games with 2-3 players, usually just the 1st. player is winning.
In games with 4-5 players, usually 1st. and 2nd. player are winning.