Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
While you control 2 or more face-up Attack Position monsters, your opponent cannot target your monster(s) with the lowest ATK for an attack.
--ガリトラップ－ピクシーの輪－
--Pixie Ring
local s,id=GetID()
function s.initial_effect(c)
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	c:RegisterEffect(e1)
	--cannot be battle target
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetCode(EFFECT_CANNOT_SELECT_BATTLE_TARGET)
	e2:SetRange(LOCATION_SZONE)
	e2:SetTargetRange(0,LOCATION_MZONE)
	e2:SetCondition(s.con)
	e2:SetValue(s.atlimit)
	c:RegisterEffect(e2)
end
function s.con(e)
	return Duel.IsExistingMatchingCard(Card.IsPosition,e:GetHandlerPlayer(),LOCATION_MZONE,0,2,nil,POS_FACEUP_ATTACK)
end
function s.tfilter(c,atk)
	return c:IsFaceup() and c:GetAttack()<atk
end
function s.atlimit(e,c)
	return c:IsFaceup() and not Duel.IsExistingMatchingCard(s.tfilter,c:GetControler(),LOCATION_MZONE,0,1,c,c:GetAttack())
end