01
Define what fair means
Fair teams do not guarantee a draw. A deflection, an excellent keeper, or one player having a brilliant night can change any small-sided game. The organiser's job is to make both teams look reasonably capable before kick-off. Players should be able to see a route to winning, and neither side should depend entirely on one standout player.
Aim for similar overall ability, enough defending and ball retention on both sides, and a workable goalkeeper plan. Consider how players combine as well as their individual level. Two strong attackers may add less balance than one attacker and one calm defender. Fairness is a sensible starting condition, not a promise about the final score.