Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If your opponent controls 2 or more monsters than you do: Your opponent must send monsters they control to the GY so they only control 1 monster.
--台貫計量
--Weighbridge
--Scripted by Hatter
local s,id=GetID()
function s.initial_effect(c)
	--Make opponent send monsters to the GY
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_TOGRAVE)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetHintTiming(0,TIMINGS_CHECK_MONSTER_E|TIMING_MAIN_END)
	e1:SetCondition(s.tgcon)
	e1:SetTarget(s.tgtg)
	e1:SetOperation(s.tgop)
	c:RegisterEffect(e1)
end
function s.tgcon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.GetFieldGroupCount(tp,0,LOCATION_MZONE)-Duel.GetFieldGroupCount(tp,LOCATION_MZONE,0)>=2
end
function s.tgfilter(c,p)
	return Duel.IsPlayerCanSendtoGrave(p,c)
end
function s.tgtg(e,tp,eg,ep,ev,re,r,rp,chk)
	local g=Duel.GetMatchingGroup(s.tgfilter,tp,0,LOCATION_MZONE,nil,1-tp)
	if chk==0 then return #g>0 end
	local ct=Duel.GetFieldGroupCount(tp,0,LOCATION_MZONE)
	Duel.SetOperationInfo(0,CATEGORY_TOGRAVE,g,math.min(ct-1,#g),0,0)
end
function s.tgop(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(s.tgfilter,tp,0,LOCATION_MZONE,nil,1-tp)
	local ct=Duel.GetFieldGroupCount(tp,0,LOCATION_MZONE)
	if ct<=1 or #g==0 then return end
	Duel.Hint(HINT_SELECTMSG,1-tp,HINTMSG_TOGRAVE)
	local tg=g:Select(1-tp,ct-1,ct-1,nil)
	if #tg>0 then
		Duel.HintSelection(tg,true)
		Duel.SendtoGrave(tg,REASON_RULE,PLAYER_NONE,1-tp)
	end
end