diff --git a/src/mills.cpp b/src/mills.cpp
index 43550225..b1a03789 100644
--- a/src/mills.cpp
+++ b/src/mills.cpp
@@ -246,7 +246,7 @@ void adjacent_squares_init() noexcept
         /* 39 */ 0,
     };
 
-    if (rule.hasObliqueLines) {
+    if (rule.hasDiagonalLines) {
         memcpy(MoveList<LEGAL>::adjacentSquares, adjacentSquares12, sizeof(MoveList<LEGAL>::adjacentSquares));
         memcpy(MoveList<LEGAL>::adjacentSquaresBB, adjacentSquaresBB12, sizeof(MoveList<LEGAL>::adjacentSquaresBB));
     } else {
@@ -368,7 +368,7 @@ void mill_table_init()
     };
 
     // TODO: change to ptr?
-    if (rule.hasObliqueLines) {
+    if (rule.hasDiagonalLines) {
         memcpy(Position::millTableBB, millTableBB12, sizeof(Position::millTableBB));
     } else {
         memcpy(Position::millTableBB, millTableBB9, sizeof(Position::millTableBB));
diff --git a/src/position.cpp b/src/position.cpp
index 1fcabc7e..6428971b 100644
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -127,7 +127,7 @@ std::ostream &operator<<(std::ostream &os, const Position &pos)
 
 #define P(s) PieceToChar(pos.piece_on(Square(s)))
 
-    if (rule.hasObliqueLines) {
+    if (rule.hasDiagonalLines) {
         os << "\n";
         os << P(31) << " --- " << P(24) << " --- " << P(25) << "\n";
         os << "|\\    |    /|\n";
@@ -1306,7 +1306,7 @@ bool Position::is_all_surrounded(Color c
 
 bool Position::is_star_square(Square s)
 {
-    if (rule.hasObliqueLines == true) {
+    if (rule.hasDiagonalLines == true) {
         return (s == 17 ||
                 s == 19 ||
                 s == 21 ||
diff --git a/src/rule.h b/src/rule.h
index a7053fbc..c3b2075b 100644
--- a/src/rule.h
+++ b/src/rule.h
@@ -33,7 +33,7 @@ struct Rule
 
     int piecesAtLeastCount; // Default is 3
 
-    bool hasObliqueLines;
+    bool hasDiagonalLines;
 
     bool hasBannedLocations;
 
diff --git a/src/ucioption.cpp b/src/ucioption.cpp
index c0fae913..a00c3a97 100644
--- a/src/ucioption.cpp
+++ b/src/ucioption.cpp
@@ -87,9 +87,9 @@ void on_piecesAtLeastCount(const Option &o)
     rule.piecesAtLeastCount = (int)o;
 }
 
-void on_hasObliqueLines(const Option &o)
+void on_hasDiagonalLines(const Option &o)
 {
-    rule.hasObliqueLines = (bool)o;
+    rule.hasDiagonalLines = (bool)o;
 }
 
 void on_hasBannedLocations(const Option &o)
@@ -169,7 +169,7 @@ void init(OptionsMap &o)
     // Rules
     o["PiecesCount"] << Option(12, 6, 12, on_piecesCount);
     o["PiecesAtLeastCount"] << Option(3, 3, 5, on_piecesAtLeastCount);
-    o["HasObliqueLines"] << Option(true, on_hasObliqueLines);
+    o["HasDiagonalLines"] << Option(true, on_hasDiagonalLines);
     o["HasBannedLocations"] << Option(true, on_hasBannedLocations);
     o["IsDefenderMoveFirst"] << Option(true, on_isDefenderMoveFirst);
     o["MayRemoveMultiple"] << Option(false, on_mayRemoveMultiple);
diff --git a/src/ui/flutter_app/lib/common/config.dart b/src/ui/flutter_app/lib/common/config.dart
index e05c2f86..9cd27fb5 100644
--- a/src/ui/flutter_app/lib/common/config.dart
+++ b/src/ui/flutter_app/lib/common/config.dart
@@ -51,7 +51,7 @@ class Config {
   // Rules
   static int piecesCount = 12;
   static int piecesAtLeastCount = 3;
-  static bool hasObliqueLines = true;
+  static bool hasDiagonalLines = true;
   static bool hasBannedLocations = true;
   static bool isDefenderMoveFirst = true;
   static bool mayRemoveMultiple = false;
@@ -100,8 +100,8 @@ class Config {
     rule.piecesCount = Config.piecesCount = profile['PiecesCount'] ?? 12;
     rule.piecesAtLeastCount =
         Config.piecesAtLeastCount = profile['PiecesAtLeastCount'] ?? 3;
-    rule.hasObliqueLines =
-        Config.hasObliqueLines = profile['HasObliqueLines'] ?? true;
+    rule.hasDiagonalLines =
+        Config.hasDiagonalLines = profile['HasDiagonalLines'] ?? true;
     rule.hasBannedLocations =
         Config.hasBannedLocations = profile['HasBannedLocations'] ?? true;
     rule.isDefenderMoveFirst =
@@ -153,7 +153,7 @@ class Config {
     // Rules
     profile['PiecesCount'] = Config.piecesCount;
     profile['PiecesAtLeastCount'] = Config.piecesAtLeastCount;
-    profile['HasObliqueLines'] = Config.hasObliqueLines;
+    profile['HasDiagonalLines'] = Config.hasDiagonalLines;
     profile['HasBannedLocations'] = Config.hasBannedLocations;
     profile['IsDefenderMoveFirst'] = Config.isDefenderMoveFirst;
     profile['MayRemoveMultiple'] = Config.mayRemoveMultiple;
diff --git a/src/ui/flutter_app/lib/engine/native_engine.dart b/src/ui/flutter_app/lib/engine/native_engine.dart
index ba6b76ba..8858ade4 100644
--- a/src/ui/flutter_app/lib/engine/native_engine.dart
+++ b/src/ui/flutter_app/lib/engine/native_engine.dart
@@ -112,7 +112,7 @@ class NativeEngine extends AiEngine {
     await send(
         'setoption name PiecesAtLeastCount value ${Config.piecesAtLeastCount}');
     await send(
-        'setoption name HasObliqueLines value ${Config.hasObliqueLines}');
+        'setoption name HasDiagonalLines value ${Config.hasDiagonalLines}');
     await send(
         'setoption name HasBannedLocations value ${Config.hasBannedLocations}');
     await send(
diff --git a/src/ui/flutter_app/lib/l10n/intl_en.arb b/src/ui/flutter_app/lib/l10n/intl_en.arb
index 1734b095..39ce5bf9 100644
--- a/src/ui/flutter_app/lib/l10n/intl_en.arb
+++ b/src/ui/flutter_app/lib/l10n/intl_en.arb
@@ -372,9 +372,9 @@
   "@piecesAtLeastCount": {
     "description": "Pieces At Least"
   },
-  "hasObliqueLines": "Has Oblique Lines",
-  "@hasObliqueLines": {
-    "description": "Has Oblique Lines"
+  "hasDiagonalLines": "Has Diagonal Lines",
+  "@hasDiagonalLines": {
+    "description": "Has Diagonal Lines"
   },
   "hasBannedLocations": "Has Banned Locations",
   "@hasBannedLocations": {
diff --git a/src/ui/flutter_app/lib/l10n/intl_zh.arb b/src/ui/flutter_app/lib/l10n/intl_zh.arb
index 97c70cdc..f1568ffb 100644
--- a/src/ui/flutter_app/lib/l10n/intl_zh.arb
+++ b/src/ui/flutter_app/lib/l10n/intl_zh.arb
@@ -93,7 +93,7 @@
   "ninePieces": "九子",
   "twelvePieces": "十二子",
   "piecesAtLeastCount": "少于几个子则输棋",
-  "hasObliqueLines": "斜线",
+  "hasDiagonalLines": "斜线",
   "hasBannedLocations": "禁点",
   "hasBannedLocations_Detail": "在摆子阶段，被吃掉的棋子的位置将不能再落子，除非进入走子阶段。",
   "isDefenderMoveFirst": "后摆子的先走子",
diff --git a/src/ui/flutter_app/lib/mill/position.dart b/src/ui/flutter_app/lib/mill/position.dart
index 1037aa8c..4784ec74 100644
--- a/src/ui/flutter_app/lib/mill/position.dart
+++ b/src/ui/flutter_app/lib/mill/position.dart
@@ -849,7 +849,7 @@ class Position {
   }
 
   void createMillTable() {
-    const millTable_noObliqueLine = [
+    const millTable_noDiagonalLine = [
       /* 0 */ [
         [0, 0],
         [0, 0],
@@ -1056,7 +1056,7 @@ class Position {
       ]
     ];
 
-    const millTable_hasObliqueLines = [
+    const millTable_hasDiagonalLines = [
       /*  0 */ [
         [0, 0],
         [0, 0],
@@ -1263,16 +1263,16 @@ class Position {
       ]
     ];
 
-    if (rule.hasObliqueLines) {
-      millTable = millTable_hasObliqueLines;
+    if (rule.hasDiagonalLines) {
+      millTable = millTable_hasDiagonalLines;
     } else {
-      millTable = millTable_noObliqueLine;
+      millTable = millTable_noDiagonalLine;
     }
   }
 
   void createMoveTable() {
     // Note: Not follow order of MoveDirection array
-    const moveTable_obliqueLine = [
+    const moveTable_diagonalLine = [
       /*  0 */ [0, 0, 0, 0],
       /*  1 */ [0, 0, 0, 0],
       /*  2 */ [0, 0, 0, 0],
@@ -1319,7 +1319,7 @@ class Position {
       /* 39 */ [0, 0, 0, 0],
     ];
 
-    const moveTable_noObliqueLine = [
+    const moveTable_noDiagonalLine = [
       /*  0 */ [0, 0, 0, 0],
       /*  1 */ [0, 0, 0, 0],
       /*  2 */ [0, 0, 0, 0],
@@ -1366,10 +1366,10 @@ class Position {
       /* 39 */ [0, 0, 0, 0],
     ];
 
-    if (rule.hasObliqueLines) {
-      moveTable = moveTable_obliqueLine;
+    if (rule.hasDiagonalLines) {
+      moveTable = moveTable_diagonalLine;
     } else {
-      moveTable = moveTable_noObliqueLine;
+      moveTable = moveTable_noDiagonalLine;
     }
   }
 
@@ -1495,7 +1495,7 @@ class Position {
   }
 
   bool isStarSquare(int s) {
-    if (rule.hasObliqueLines == true) {
+    if (rule.hasDiagonalLines == true) {
       return (s == 17 || s == 19 || s == 21 || s == 23);
     }
 
diff --git a/src/ui/flutter_app/lib/mill/rule.dart b/src/ui/flutter_app/lib/mill/rule.dart
index 7755f6b9..05419b79 100644
--- a/src/ui/flutter_app/lib/mill/rule.dart
+++ b/src/ui/flutter_app/lib/mill/rule.dart
@@ -21,7 +21,7 @@ class Rule {
   String description = "";
   int piecesCount = 12; // 9 or 12
   int piecesAtLeastCount = 3; // Default is 3
-  bool hasObliqueLines = true;
+  bool hasDiagonalLines = true;
   bool hasBannedLocations = true;
   bool isDefenderMoveFirst = true;
   bool mayRemoveMultiple = false;
diff --git a/src/ui/flutter_app/lib/painting/board_painter.dart b/src/ui/flutter_app/lib/painting/board_painter.dart
index 36be761d..ba711f49 100644
--- a/src/ui/flutter_app/lib/painting/board_painter.dart
+++ b/src/ui/flutter_app/lib/painting/board_painter.dart
@@ -177,32 +177,32 @@ class BoardPainter extends PiecesBasePainter {
       paint,
     );
 
-    if (!Config.hasObliqueLines) {
+    if (!Config.hasDiagonalLines) {
       return;
     }
 
-    // top left oblique line
+    // top left diagonal line
     canvas.drawLine(
       Offset(left + 0, top),
       Offset(left + squareWidth * 2, top + squareWidth * 2),
       paint,
     );
 
-    // lower right oblique line
+    // lower right diagonal line
     canvas.drawLine(
       Offset(left + squareWidth * 4, top + squareWidth * 4),
       Offset(left + squareWidth * 6, top + squareWidth * 6),
       paint,
     );
 
-    // top right oblique line
+    // top right diagonal line
     canvas.drawLine(
       Offset(left + squareWidth * 6, top),
       Offset(left + squareWidth * 4, top + squareWidth * 2),
       paint,
     );
 
-    // lower left oblique line
+    // lower left diagonal line
     canvas.drawLine(
       Offset(left + squareWidth * 2, top + squareWidth * 4),
       Offset(left + squareWidth * 0, top + squareWidth * 6),
diff --git a/src/ui/flutter_app/lib/widgets/rule_settings_page.dart b/src/ui/flutter_app/lib/widgets/rule_settings_page.dart
index c03ddfcd..483c67ba 100644
--- a/src/ui/flutter_app/lib/widgets/rule_settings_page.dart
+++ b/src/ui/flutter_app/lib/widgets/rule_settings_page.dart
@@ -92,10 +92,10 @@ class _RuleSettingsPageState extends State<RuleSettingsPage> {
     Config.save();
   }
 
-  setHasObliqueLines(bool value) async {
+  setHasDiagonalLines(bool value) async {
     //
     setState(() {
-      rule.hasObliqueLines = Config.hasObliqueLines = value;
+      rule.hasDiagonalLines = Config.hasDiagonalLines = value;
     });
 
     Config.save();
@@ -214,10 +214,10 @@ class _RuleSettingsPageState extends State<RuleSettingsPage> {
                   _buildDivider(),
                   SwitchListTile(
                     activeColor: UIColors.primaryColor,
-                    value: Config.hasObliqueLines,
+                    value: Config.hasDiagonalLines,
                     title:
-                        Text(S.of(context).hasObliqueLines, style: itemStyle),
-                    onChanged: setHasObliqueLines,
+                        Text(S.of(context).hasDiagonalLines, style: itemStyle),
+                    onChanged: setHasDiagonalLines,
                   ),
                   _buildDivider(),
                   SwitchListTile(
diff --git a/src/ui/qt/boarditem.cpp b/src/ui/qt/boarditem.cpp
index ae9365f2..17d6167e 100644
--- a/src/ui/qt/boarditem.cpp
+++ b/src/ui/qt/boarditem.cpp
@@ -78,7 +78,7 @@ QPainterPath BoardItem::shape() const
 
 void BoardItem::setDiagonal(bool arg)
 {
-    hasObliqueLine = arg;
+    hasDiagonalLine = arg;
     update(boundingRect());
 }
 
@@ -127,7 +127,7 @@ void BoardItem::paint(QPainter *painter,
         painter->drawLine(position[i], position[(FILE_NB - 1) * RANK_NB + i]);
     }
 
-    if (hasObliqueLine) {
+    if (hasDiagonalLine) {
         // Draw 4 diagonal lines
         for (int i = 1; i  < RANK_NB; i += 2) {
             painter->drawLine(position[i], position[(FILE_NB - 1) * RANK_NB + i]);
diff --git a/src/ui/qt/boarditem.h b/src/ui/qt/boarditem.h
index 6b57f30b..1f160160 100644
--- a/src/ui/qt/boarditem.h
+++ b/src/ui/qt/boarditem.h
@@ -69,7 +69,7 @@ private:
     int size;    // board size
     int sizeShadow {5};
     QPointF position[EFFECTIVE_SQUARE_NB];    // 24 points
-    bool hasObliqueLine {false};
+    bool hasDiagonalLine {false};
 };
 
 #endif // BOARDITEM_H
diff --git a/src/ui/qt/game.cpp b/src/ui/qt/game.cpp
index 502c4aaf..36f8c5d2 100644
--- a/src/ui/qt/game.cpp
+++ b/src/ui/qt/game.cpp
@@ -257,7 +257,7 @@ void Game::gameReset()
     currentPiece = nullptr;
 
     // Redraw pieces
-    scene.setDiagonal(rule.hasObliqueLines);
+    scene.setDiagonal(rule.hasDiagonalLines);
 
     // Draw all the pieces and put them in the starting position
     // 0: the first piece in the first hand; 1: the first piece in the second hand