diff --git a/tests/gui/interact/ui-location-solver-test.cpp b/tests/gui/interact/ui-location-solver-test.cpp
index ab2378abb..09d5338e0 100644
--- a/tests/gui/interact/ui-location-solver-test.cpp
+++ b/tests/gui/interact/ui-location-solver-test.cpp
@@ -136,14 +136,58 @@ namespace test {
       
       
       
+      /** @test cover theoretical corner cases regarding the process of location solving.
+       * Point in question are the requirements and limits when querying against one or several 
+       * location specification clauses. The actual matching of a location pattern against a UI topology
+       * is beyond scope and covered [elsewhere](\ref UICoordResolver_test::verify_mutateCoverage)
+       * - empty clauses act as neutral element
+       * - prerequisites regarding the depth of a location clause relevant for solution
+       * - the impact of the query and especially its expected depth
+       * - completely explicit clauses vs clauses with wildcards
+       * - relevance of partial or total coverage for the solution
+       * - regular clauses vs. _create clauses_ (which mandate creating parents as needed)
+       * - usage of the first applicable solution when several clauses are given
+       */
       void
       verify_cornerCases()
         {
-          UNIMPLEMENTED ("cover some corner cases");
+           //-------------------------------------------------------------Test-Fixture
+          GenNodeLocationQuery tree{MakeRec()
+                                      .set("win"
+                                          , MakeRec()
+                                              .type("A")
+                                              .set ("thePanel"
+                                                   , MakeRec()
+                                                       .set ("theView"
+                                                            , MakeRec()
+                                                                .set ("#5"
+                                                                     , MakeRec()
+                                                                         .set ("down"
+                                                                              , MakeRec()
+                                                                                  .set ("the"
+                                                                                       , MakeRec()
+                                                                                           .set ("kitchen"
+                                                                                                , MakeRec()
+                                                                                                    .set ("sink", MakeRec())
+                                                                                                )
+                                                                                       )
+                                                                              )
+                                                                     )
+                                                            )
+                                                   )
+                                          )};
+          UILocationSolver solver{tree};
+          //--------------------------------------------------------------(End)Test-Fixture
+          
           
           /* === empty clause === */
+          LocationRule r1 = UICoord();
+          CHECK (isnil (solver.solve (r1, UIC_PATH, "to/salvation")));
           
           /* === empty clause is neutral === */
+          r1.append (UICoord().path("down/to/hell"));
+          auto s1 = solver.solve(r1, UIC_PATH+2, "well");
+          CHECK ("UI:win[A]-thePanel.theView.#5/down/to/hell" == string(s1));
           
 
           /* === clause too short === */
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index 8ea58f64a..b1e6bd2b7 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -9923,6 +9923,20 @@
 <icon BUILTIN="button_ok"/>
 </node>
 </node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1518312817798" ID="ID_473624624" MODIFIED="1518312839006">
+<richcontent TYPE="NODE"><html>
+  <head>
+    
+  </head>
+  <body>
+    <p>
+      Schreibweise f&#252;r <i>create Clauses</i>
+    </p>
+  </body>
+</html>
+</richcontent>
+<icon BUILTIN="flag-yellow"/>
+</node>
 </node>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1517505346701" ID="ID_1733459677" MODIFIED="1518219028843" TEXT="LocationSolver einf&#xfc;hren">
 <linktarget COLOR="#7999a3" DESTINATION="ID_1733459677" ENDARROW="Default" ENDINCLINATION="460;0;" ID="Arrow_ID_1447990036" SOURCE="ID_570287604" STARTARROW="None" STARTINCLINATION="-15;211;"/>
@@ -10155,6 +10169,12 @@
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1517505737977" ID="ID_1981924615" MODIFIED="1517506790089" TEXT="Unit-Test">
 <arrowlink COLOR="#465888" DESTINATION="ID_957265584" ENDARROW="Default" ENDINCLINATION="351;-62;" ID="Arrow_ID_1922023705" STARTARROW="None" STARTINCLINATION="-226;69;"/>
 <icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1518312788963" ID="ID_1715641481" MODIFIED="1518312793227" TEXT="brauche Setup">
+<icon BUILTIN="button_ok"/>
+</node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1518312794346" ID="ID_98359518" MODIFIED="1518312805737" TEXT="Schreibweise f&#xfc;r create-Klauseln im Test">
+<icon BUILTIN="flag-yellow"/>
+</node>
 </node>
 </node>
 </node>
@@ -10226,6 +10246,9 @@
 </node>
 </node>
 </node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1518312758758" ID="ID_675085959" MODIFIED="1518312769326" TEXT="Schreibweise f&#xfc;r create-Klauseln">
+<icon BUILTIN="flag-yellow"/>
+</node>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1515631675752" ID="ID_1586757410" MODIFIED="1515631712140" TEXT="Repr&#xe4;sentation als Liste von UICoord">
 <icon BUILTIN="flag-yellow"/>
 </node>
@@ -10793,8 +10816,8 @@
 <node CREATED="1518220764202" ID="ID_1551836374" MODIFIED="1518221675074" TEXT="geht nicht">
 <icon BUILTIN="broken-line"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1518220767426" ID="ID_1678897927" MODIFIED="1518221677895" TEXT="aber eine leere Klausel geht">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1518220767426" ID="ID_1678897927" MODIFIED="1518312514423" TEXT="aber eine leere Klausel geht">
+<icon BUILTIN="button_ok"/>
 </node>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1518221630349" ID="ID_748354557" MODIFIED="1518221679006" TEXT="leere Klausel plus andere">
 <icon BUILTIN="flag-yellow"/>