This scripts create a basic Death count for basic death match.

initServer.sqf

execVM "publicEventHandlers.sqf";

{
  if ((side _x) == WEST) then {
    _x addEventHandler ["Killed",{
      _unitSide = (side _this select 0);
      _killerSide = (side _this select 1);
      if (_unitSide == _killerSide) then {
        "BLUFOR TEAMKILL" remoteExec ["hint"];
      } else {
        publicVariableServer "bluforKilled";
      }
    }];
  }

  if ((side _x) == WEST) then {
    _x addEventHandler ["Killed",{
      _unitSide = (side _this select 0);
      _killerSide = (side _this select 1);
      if (_unitSide == _killerSide) then {
        "OPFOR TEAMKILL" remoteExec ["hint"];
      } else {
        publicVariableServer "opforKilled";
      }
    }];
  }
} forEach allUnits;

publicEventHandlers.sqf

killLimit = 3;
bluforDeaths = 0;
opforDeaths = 0;

"bluforKilled" addPublicVariableEventHandler {
  bluforDeaths = bluforDeaths + 1;
  if ( bluforDeaths >= killLimit) then {
    "BLUFOR LIMIT REACHED" remoteExec ["hint"];
    [] remoteExec "BIS_fnc_endMission"
  }
}

"opforKilled" addPublicVariableEventHandler {
  opforDeaths= bluforDeaths + 1;
  if ( bopforDeath >= killLimit) then {
    "OPFOR LIMIT REACHED" remoteExec ["hint"];
    [] remoteExec "BIS_fnc_endMission"
  }
}