diff --git a/domain/src/main/kotlin/ch/dissem/yaep/domain/Game.kt b/domain/src/main/kotlin/ch/dissem/yaep/domain/Game.kt
index 7ef6422..89adbcc 100644
--- a/domain/src/main/kotlin/ch/dissem/yaep/domain/Game.kt
+++ b/domain/src/main/kotlin/ch/dissem/yaep/domain/Game.kt
@@ -6,10 +6,9 @@ class Game(
 ) {
     val horizontalClues = clues.filterIsInstance<HorizontalClue>()
     val verticalClues = clues.filterIsInstance<SameColumnClue<ItemClass<*>, ItemClass<*>>>()
-    val positionalClues = clues.filterIsInstance<PositionClue<ItemClass<*>>>()
 
     init {
-        for (position in positionalClues) {
+        for (position in clues.filterIsInstance<PositionClue<ItemClass<*>>>()) {
             val row = grid[position.item.itemType.companion]
             row.forEachIndexed { index, gameCell ->
                 if (index == position.index) {
@@ -34,4 +33,8 @@ class Game(
 
     fun areRulesViolated(): Boolean = clues
         .any { it.isRuleViolated(grid) }
-}
\ No newline at end of file
+
+    override fun toString(): String {
+        return grid.toString() + "\n\n" + clues.joinToString("\n* ", prefix = "* ")
+    }
+}
diff --git a/domain/src/main/kotlin/ch/dissem/yaep/domain/Grid.kt b/domain/src/main/kotlin/ch/dissem/yaep/domain/Grid.kt
index 1349a5c..895b6a8 100644
--- a/domain/src/main/kotlin/ch/dissem/yaep/domain/Grid.kt
+++ b/domain/src/main/kotlin/ch/dissem/yaep/domain/Grid.kt
@@ -19,8 +19,9 @@ class Grid(
     }
 
     override fun toString(): String {
-        return rows.map { row -> row.map { it.selection?.symbol ?: "  " }.joinToString("") }
-            .joinToString("\n")
+        return rows.joinToString("\n") { row ->
+            row.joinToString("") { it.selection?.symbol ?: "  " }
+        }
     }
 }
 
diff --git a/domain/src/test/kotlin/ch/dissem/yaep/domain/OrderClueTest.kt b/domain/src/test/kotlin/ch/dissem/yaep/domain/OrderClueTest.kt
index e94a775..d2b8df8 100644
--- a/domain/src/test/kotlin/ch/dissem/yaep/domain/OrderClueTest.kt
+++ b/domain/src/test/kotlin/ch/dissem/yaep/domain/OrderClueTest.kt
@@ -25,4 +25,36 @@ class OrderClueTest : ClueTest() {
         }
     }
 
-}
\ No newline at end of file
+    @Test
+    fun `ensure items in wrong order are valid`() {
+        val grid = createGrid()
+        for (ia in 0 until size) {
+            for (ib in 0 until size) {
+                for (ic in 0 until size) {
+                    for (ja in 0 until size - 1) {
+                        for (jb in ja until size) {
+                            val a = grid[ia][ja]
+                            val b = grid[ib][jb]
+
+                            expect(OrderClue(b.solution, a.solution).isRuleViolated(grid))
+                                .toEqual(true)
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    @Test
+    fun `ensure items in the same column are not valid`() {
+        val grid = createGrid()
+        for (rowA in grid.rows) {
+            for (rowB in grid.rows) {
+                for (i in 0 until size) {
+                    expect(OrderClue(rowA[i].solution, rowB[i].solution).isRuleViolated(grid))
+                        .toEqual(true)
+                }
+            }
+        }
+    }
+}