[Rudy_]

What you exactly want to do?

This will give the killer +1 score each time he kill someone.
And who die will lose -1 score

pawn Код:

public OnPlayerDeath(playerid, killerid, reason)
{
    if(killerid != INVALID_PLAYER_ID) SetPlayerScore(killerid, GetPlayerScore(killerid) + 1);
    SetPlayerScore(playerid, GetPlayerScore(playerid) -1);
    return 1;
}