diff --git a/RELEASE b/RELEASE
index 561372d5b..c6d7cd18e 100644
--- a/RELEASE
+++ b/RELEASE
@@ -1,5 +1,6 @@
                                   EYE release
 
+v5.0.0 (2023-10-03) scope of blank nodes is graph term for N3 and explicit for RDF Surfaces
 v4.18.7 (2023-10-02) refresh is now coherentlogic
 v4.18.6 (2023-10-01) fixing trigger for refresh
 v4.18.5 (2023-10-01) supporting premis disjunction for refresh
diff --git a/VERSION b/VERSION
index 6d26451a2..0062ac971 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.18.7
+5.0.0
diff --git a/eye.pl b/eye.pl
index e3d8da545..214a120a4 100644
--- a/eye.pl
+++ b/eye.pl
@@ -21,7 +21,7 @@
 :- use_module(library(pcre)).
 :- catch(use_module(library(http/http_open)), _, true).
 
-version_info('EYE v4.18.7 (2023-10-02)').
+version_info('EYE v5.0.0 (2023-10-03)').
 
 license_info('MIT License
 
@@ -1460,9 +1460,9 @@
         ->  assertz(flag(coherentlogic))
         ;   true
         ),
-        (   \+flag(rdfsurfaces),
-            functor(Rt, F, _),
-            regex('^<.*#on.*Surface>$', F, _)
+        (   functor(Rt, F, _),
+            regex('^<.*#on.*Surface>$', F, _),
+            \+flag(rdfsurfaces)
         ->  assertz(flag(rdfsurfaces))
         ;   true
         ),
@@ -1970,10 +1970,6 @@
     A =.. [C|D],
     tr_tr(D, E),
     (   regex('^\'<.*#on.*Surface>\'$', C, _),
-        (   \+flag(rdfsurfaces)
-        ->  assertz(flag(rdfsurfaces))
-        ;   true
-        ),
         E = [V, G],
         is_list(V),
         is_graph(G),
@@ -2520,7 +2516,13 @@
 
 propertylist(Subject, Triples) -->
     verb(Item, Triples1),
-    {   prolog_verb(Item, Verb)
+    {   prolog_verb(Item, Verb),
+        (   atomic(Verb),
+            regex('^\'<.*#on.*Surface>\'$', Verb, _),
+            \+flag(rdfsurfaces)
+        ->  assertz(flag(rdfsurfaces))
+        ;   true
+        )
     },
     object(Object, Triples2),
     {   (   Verb = isof(Vrb)
@@ -2684,14 +2686,29 @@
     }.
 symbol(Name) -->
     [bnode(Lbl)],
-    {   atom_codes(Lbl, LblCodes),
-        subst([[[0'-], [0'_, 0'M, 0'I, 0'N, 0'U, 0'S, 0'_]], [[0'.], [0'_, 0'D, 0'O, 0'T, 0'_]]], LblCodes, LblTidy),
-        atom_codes(Label, LblTidy),
-        (   evar(Label, S, 0)
-        ->  true
-        ;   atom_concat(Label, '_', M),
-            gensym(M, S),
-            assertz(evar(Label, S, 0))
+    {   (   flag(rdfsurfaces)
+        ->  atom_codes(Lbl, LblCodes),
+            subst([[[0'-], [0'_, 0'M, 0'I, 0'N, 0'U, 0'S, 0'_]], [[0'.], [0'_, 0'D, 0'O, 0'T, 0'_]]], LblCodes, LblTidy),
+            atom_codes(Label, LblTidy),
+            (   evar(Label, S, 0)
+            ->  true
+            ;   atom_concat(Label, '_', M),
+                gensym(M, S),
+                assertz(evar(Label, S, 0))
+            )
+        ;   nb_getval(fdepth, D),
+            (   D =:= 0
+            ->  Label = Lbl
+            ;   atom_codes(Lbl, LblCodes),
+                subst([[[0'-], [0'_, 0'M, 0'I, 0'N, 0'U, 0'S, 0'_]], [[0'.], [0'_, 0'D, 0'O, 0'T, 0'_]]], LblCodes, LblTidy),
+                atom_codes(Label, LblTidy)
+            ),
+            (   evar(Label, S, D)
+            ->  true
+            ;   atom_concat(Label, '_', M),
+                gensym(M, S),
+                assertz(evar(Label, S, D))
+            )
         ),
         (   (   nb_getval(entail_mode, false),
                 nb_getval(fdepth, 0)
diff --git a/eye.zip b/eye.zip
index 6010343b7..8621a96c2 100644
Binary files a/eye.zip and b/eye.zip differ
diff --git a/reasoning/bi/biA.n3 b/reasoning/bi/biA.n3
index 311ee6cc3..cd0a46d4d 100644
--- a/reasoning/bi/biA.n3
+++ b/reasoning/bi/biA.n3
@@ -492,12 +492,12 @@
 {
     {
         <http://eyereasoner.github.io/eye/reasoning/bi/ab_c.n3> log:semantics {
-            :a :b _:e_c_2.
+            :a :b _:e_c_14.
         }.
         {
-            :a :b _:e_c_2.
+            :a :b _:e_c_14.
         } log:equalTo {
-            :a :b _:e_c_2.
+            :a :b _:e_c_14.
         }.
     } => {
         :loges3 :result true.
@@ -663,12 +663,12 @@
 {
     {
         <http://eyereasoner.github.io/eye/reasoning/bi/ab_c.n3> log:semantics {
-            :a :b _:e_c_2.
+            :a :b _:e_c_14.
         }.
         {
-            :a :b _:e_c_2.
+            :a :b _:e_c_14.
         } log:includes {
-            :a :b _:e_c_2.
+            :a :b _:e_c_14.
         }.
     } => {
         :logis3 :result true.
@@ -791,10 +791,10 @@
 {
     {
         <http://eyereasoner.github.io/eye/reasoning/bi/ab_c.n3> log:semantics {
-            :a :b _:e_c_2.
+            :a :b _:e_c_14.
         }.
         {
-            :a :b _:e_c_2.
+            :a :b _:e_c_14.
         } log:notIncludes {
             :a :b :c.
         }.
@@ -805,13 +805,13 @@
 {
     {
         <http://eyereasoner.github.io/eye/reasoning/bi/ab_c.n3> log:semantics {
-            :a :b _:e_c_2.
+            :a :b _:e_c_14.
         }.
         <http://eyereasoner.github.io/eye/reasoning/bi/abc.n3> log:semantics {
             :a :b :c.
         }.
         {
-            :a :b _:e_c_2.
+            :a :b _:e_c_14.
         } log:notIncludes {
             :a :b :c.
         }.
diff --git a/reasoning/blogic/version.n3s.out b/reasoning/blogic/version.n3s.out
index bcdf820e3..a9893ec69 100644
--- a/reasoning/blogic/version.n3s.out
+++ b/reasoning/blogic/version.n3s.out
@@ -1,3 +1,3 @@
 @prefix log: <http://www.w3.org/2000/10/swap/log#>.
 
-() log:version "EYE v4.18.7 (2023-10-02)".
+() log:version "EYE v5.0.0 (2023-10-03)".
diff --git a/reasoning/iq/iqA.n3 b/reasoning/iq/iqA.n3
index f2298396b..1a636fe2e 100644
--- a/reasoning/iq/iqA.n3
+++ b/reasoning/iq/iqA.n3
@@ -1,7 +1,7 @@
 @prefix : <http://example.org/test#>.
 
 _:e_x_1 :says {
-    _:e_x_1 :knows :Albert.
+    _:e_x_3 :knows :Albert.
 }.
 :s :p :o.
 :s :pp {
@@ -10,7 +10,7 @@ _:e_x_1 :says {
 {
     ?U_0 :knows :Albert.
 } => {
-    ?U_0 :knows :Kurt.
+    <http://eyereasoner.github.io/var#x_0> :knows :Kurt.
 }.
 {
     :e :p :a.