diff --git a/unofficial/c511027621.lua b/unofficial/c511027621.lua
new file mode 100644
index 0000000000..7bf651f5d4
--- /dev/null
+++ b/unofficial/c511027621.lua
@@ -0,0 +1,65 @@
+--逆襲！
+--Counterattack!
+--Made by When
+local s,id=GetID()
+function s.initial_effect(c)
+	--Force a Battle
+	local e1=Effect.CreateEffect(c)
+	e1:SetType(EFFECT_TYPE_ACTIVATE)
+	e1:SetCode(EVENT_FREE_CHAIN)
+	e1:SetCondition(s.condition)
+	e1:SetTarget(s.target)
+	e1:SetOperation(s.activate)
+	c:RegisterEffect(e1)
+	aux.GlobalCheck(s,function()
+        s[0]=true
+        s[1]=true
+        local ge1=Effect.CreateEffect(c)
+        ge1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
+        ge1:SetCode(EVENT_BATTLED)
+        ge1:SetOperation(s.checkop)
+        Duel.RegisterEffect(ge1,0)
+        local ge2=Effect.CreateEffect(c)
+        ge2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
+        ge2:SetCode(EVENT_ADJUST)
+        ge2:SetCountLimit(1)
+        ge2:SetOperation(s.clear)
+        Duel.RegisterEffect(ge2,0)
+    end)
+end
+function s.checkop(e,tp,eg,ep,ev,re,r,rp)
+    local at=Duel.GetAttackTarget()
+    if at and at:IsRelateToBattle() then
+        s[at:GetControler()]=true
+    end
+end
+function s.clear(e,tp,eg,ep,ev,re,r,rp)
+    s[0]=false
+    s[1]=false
+end
+function s.condition(e,tp,eg,ep,ev,re,r,rp)
+    return tp~=Duel.GetTurnPlayer() and Duel.GetCurrentPhase()>=PHASE_BATTLE_START and Duel.GetCurrentPhase()<=PHASE_BATTLE and s[tp]
+end
+function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
+	if chk==0 then return Duel.IsExistingMatchingCard(Card.IsMonster,tp,0,LOCATION_MZONE,1,nil) and Duel.IsExistingMatchingCard(Card.IsMonster,tp,LOCATION_MZONE,0,1,nil) and Duel.IsExistingMatchingCard(Card.IsPosition,tp,LOCATION_MZONE,0,1,nil,POS_FACEUP_ATTACK) or Duel.IsExistingMatchingCard(Card.IsPosition,tp,0,LOCATION_MZONE,1,nil,POS_FACEUP_ATTACK) end
+end
+function s.activate(e,tp,eg,ep,ev,re,r,rp)
+    local g2=Duel.SelectMatchingCard(tp,Card.IsMonster,tp,LOCATION_MZONE,0,1,1,nil):GetFirst()
+	local g1=Duel.SelectMatchingCard(tp,Card.IsMonster,tp,0,LOCATION_MZONE,1,1,nil):GetFirst()
+	if g1:IsPosition(POS_FACEUP_DEFENSE) or g1:IsPosition(POS_FACEDOWN_DEFENSE) then
+	   g2=Duel.SelectMatchingCard(tp,Card.IsPosition,tp,LOCATION_MZONE,0,1,1,nil,POS_FACEUP_ATTACK):GetFirst()
+	elseif g2:IsPosition(POS_FACEUP_DEFENSE) or g2:IsPosition(POS_FACEDOWN_DEFENSE) then
+	   g1=Duel.SelectMatchingCard(tp,Card.IsPosition,tp,0,LOCATION_MZONE,1,1,nil,POS_FACEUP_ATTACK):GetFirst()
+	else
+	   g2=Duel.SelectMatchingCard(tp,Card.IsMonster,tp,LOCATION_MZONE,0,1,1,nil):GetFirst()
+	   g1=Duel.SelectMatchingCard(tp,Card.IsMonster,tp,0,LOCATION_MZONE,1,1,nil):GetFirst()
+	end
+	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_FACEUP)
+	if g1:IsPosition(POS_FACEUP_DEFENSE) or g1:IsPosition(POS_FACEDOWN_DEFENSE) and g2:IsPosition(POS_FACEUP_ATTACK) and g1 and g2 then
+		Duel.CalculateDamage(g2,g1)
+	elseif g2:IsPosition(POS_FACEUP_DEFENSE) or g2:IsPosition(POS_FACEDOWN_DEFENSE) and g1:IsPosition(POS_FACEUP_ATTACK) and g1 and g2 then
+	    Duel.CalculateDamage(g1,g2)
+	else
+	    Duel.CalculateDamage(g2,g1)
+	end
+end