Victory Conditon probs

Hi everyone, I have so problem to enforce the victory condition,i wanna make win someone if hes the only one on the game or 2 people if they are ally ( Force Ally )
I tryed a lot of thing but it still doesn't work,i tryed the Game - melee enforce victory / defeat condition but doesnt work to.If someone could help me

You want an event that fires when a player leaves, and an integer check for the number of players who match your conditions (still in game, on team, etc.)

uh? so i have to count the number of players and at each player who left the game i set the var = var - 1

But if it's it i have a problem , i have 2 triggers :
1 - Player 1 Leaves the game ( to 8 )

2{ - Player 1 Nurrite become < 1 ( to 8 )
Game - Defead Triggering player
}
and if i set var = var - 1 on the second trigger and on the first will it set -2 if the trigger which is executed is the second