diff --git a/programr.md b/programr.md
index 1d1d683d..a7930d00 100644
--- a/programr.md
+++ b/programr.md
@@ -66,7 +66,7 @@ The entry point for a search is a routine called `Thread::search()`. This functi
 
 `search()` does some other special processing because it is at the top of the search tree. This function then calls `search()` to recursively process lower-depth nodes.
 
-The first step in search() is to check if the current board position is drawn, due to a 3-fold repetition of moves, or the 50-move rule.
+The first step in search() is to check if the current board position is drawn, due to a 3-fold repetition of moves, or the N-move rule.
 
 Sanmill will also terminate the search immediately if the absolute maximum ply depth is reached. This is quite unlikely.
 
diff --git a/src/mills.cpp b/src/mills.cpp
index c478dfd5..13ac7d89 100644
--- a/src/mills.cpp
+++ b/src/mills.cpp
@@ -28,7 +28,7 @@
 const char *loseReasonNoWayStr = "Player%d no way to go. Player%d win!";
 const char *loseReasonTimeOverStr = "Time over. Player%d win!";
 const char *drawReasonThreefoldRepetitionStr = "Threefold Repetition. Draw!";
-const char *drawReasonRule50Str = "Fifty-move rule. Draw!";
+const char *drawReasonRule50Str = "N-move rule. Draw!";
 const char *loseReasonBoardIsFullStr = "Full. Player2 win!";
 const char *drawReasonBoardIsFullStr = "Full. In draw!";
 const char *loseReasonlessThanThreeStr = "Player%d win!";
diff --git a/src/perfect/perfect_test.cpp b/src/perfect/perfect_test.cpp
index fbb7b94a..2f1db08f 100644
--- a/src/perfect/perfect_test.cpp
+++ b/src/perfect/perfect_test.cpp
@@ -7,6 +7,7 @@
 #include "perfectAI.h"
 #include "perfect.h"
 
+#include "rule.h"
 #include "config.h"
 
 using namespace std;
@@ -99,7 +100,7 @@ int perfect_main(void)
 
 #ifdef SELF_PLAY
             moveCount++;
-            if (moveCount > 99) {
+            if (moveCount > rule.maxStepsLedToDraw) {
                 goto out;
             }
 #endif // SELF_PLAY
diff --git a/src/position.cpp b/src/position.cpp
index c4bd594f..36e64d60 100644
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -208,7 +208,7 @@ Position &Position::set(const string &fenStr, Thread *th)
 
        6) Halfmove clock. This is the number of halfmoves since the last
           capture. This is used to determine if a draw can be claimed under the
-          fifty-move rule.
+          N-move rule.
 
        7) Fullmove number. The number of the full move. It starts at 1, and is
           incremented after White's move.
diff --git a/src/rule.cpp b/src/rule.cpp
index 42e33a1a..fb40d4cd 100644
--- a/src/rule.cpp
+++ b/src/rule.cpp
@@ -35,7 +35,7 @@ struct Rule rule = {
         true,       // 摆棋满子（闷棋，只有12子棋才出现）算先手负
         true,       // 走棋阶段不能行动（被“闷”）算负
         true,       // 剩三子时可以飞棋
-        99          // 99半步即50回合
+        100         // 100着
 };
 
 const struct Rule RULES[N_RULES] = {
@@ -60,7 +60,7 @@ const struct Rule RULES[N_RULES] = {
         true,       // 摆棋满子（闷棋，只有12子棋才出现）算先手负
         true,       // 走棋阶段不能行动（被“闷”）算负
         false,      // 剩三子时不可以飞棋
-        99          // 99半步即50回合
+        100         // 100着
     },
     {
         "打三棋(12连棋)",           // 打三棋
@@ -71,7 +71,7 @@ const struct Rule RULES[N_RULES] = {
         "4. 走棋阶段，后摆棋的一方先走；\n"
         "5. 同时出现两个“三连”只能提一子；\n"
         "6. 其它规则与成三棋基本相同。",
-        12,          // 双方各12子
+        12,         // 双方各12子
         3,          // 飞子条件为剩余3颗子
         3,          // 赛点子数为3
         true,       // 有斜线
@@ -82,7 +82,7 @@ const struct Rule RULES[N_RULES] = {
         true,       // 摆棋满子（闷棋，只有12子棋才出现）算先手负
         true,       // 走棋阶段不能行动（被“闷”）算负
         false,      // 剩三子时不可以飞棋
-        99          // 99半步即50回合
+        100         // 100着
     },
     {
         "Nine men's morris",      // 莫里斯九子棋
@@ -99,7 +99,7 @@ const struct Rule RULES[N_RULES] = {
         true,       // 摆棋满子（闷棋，只有12子棋才出现）算先手负
         true,       // 走棋阶段不能行动（被“闷”）算负
         true,       // 剩三子时可以飞棋
-        99          // 99半步即50回合
+        100         // 100着
     },
     {
         "Twelve men's morris",      // 莫里斯十二子棋
@@ -120,8 +120,8 @@ const struct Rule RULES[N_RULES] = {
         false,      // 不能提对手的“三连”子，除非无子可提；
         true,       // 摆棋满子（闷棋，只有12子棋才出现）算先手负
         true,       // 走棋阶段不能行动（被“闷”）算负
-        true,      // 剩三子时可以飞棋
-        99          // 99半步即50回合
+        true,       // 剩三子时可以飞棋
+        100         // 100着
     }
 };
 
diff --git a/src/search.cpp b/src/search.cpp
index 13d2c556..acfe6094 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -219,7 +219,7 @@ Value search(Position *pos, Sanmill::Stack<Position> &ss, Depth depth, Depth ori
     Depth epsilon;
 
 #ifdef RULE_50
-    if (pos->rule50_count() > 99) {
+    if (pos->rule50_count() > rule.maxStepsLedToDraw) {
         alpha = VALUE_DRAW;
         if (alpha >= beta) {
             return alpha;
diff --git a/src/ucioption.cpp b/src/ucioption.cpp
index a82bb49d..de3c68f5 100644
--- a/src/ucioption.cpp
+++ b/src/ucioption.cpp
@@ -202,7 +202,7 @@ void init(OptionsMap &o)
     o["IsWhiteLoseButNotDrawWhenBoardFull"] << Option(true, on_isWhiteLoseButNotDrawWhenBoardFull);
     o["IsLoseButNotChangeSideWhenNoWay"] << Option(true, on_isLoseButNotChangeSideWhenNoWay);
     o["MayFly"] << Option(true, on_mayFly);
-    o["MaxStepsLedToDraw"] << Option(50, 10, 200, on_maxStepsLedToDraw);
+    o["MaxStepsLedToDraw"] << Option(100, 10, 200, on_maxStepsLedToDraw);
 }
 
 
diff --git a/src/ui/flutter_app/lib/common/config.dart b/src/ui/flutter_app/lib/common/config.dart
index 3a3beeb0..c2bd2c44 100644
--- a/src/ui/flutter_app/lib/common/config.dart
+++ b/src/ui/flutter_app/lib/common/config.dart
@@ -76,7 +76,7 @@ class Config {
   static bool isWhiteLoseButNotDrawWhenBoardFull = true;
   static bool isLoseButNotChangeSideWhenNoWay = true;
   static bool mayFly = true;
-  static int maxStepsLedToDraw = 50;
+  static int maxStepsLedToDraw = 100;
 
   static Future<void> loadSettings() async {
     print("[config] Loading settings...");
@@ -156,7 +156,7 @@ class Config {
             settings['IsLoseButNotChangeSideWhenNoWay'] ?? true;
     rule.mayFly = Config.mayFly = settings['MayFly'] ?? true;
     rule.maxStepsLedToDraw =
-        Config.maxStepsLedToDraw = settings['MaxStepsLedToDraw'] ?? 50;
+        Config.maxStepsLedToDraw = settings['MaxStepsLedToDraw'] ?? 100;
 
     settingsLoaded = true;
     print("[config] Loading settings done!");
diff --git a/src/ui/flutter_app/lib/mill/rule.dart b/src/ui/flutter_app/lib/mill/rule.dart
index 37b52262..8f48e406 100644
--- a/src/ui/flutter_app/lib/mill/rule.dart
+++ b/src/ui/flutter_app/lib/mill/rule.dart
@@ -30,7 +30,7 @@ class Rule {
   bool isWhiteLoseButNotDrawWhenBoardFull = true;
   bool isLoseButNotChangeSideWhenNoWay = true;
   bool mayFly = true;
-  int maxStepsLedToDraw = 50;
+  int maxStepsLedToDraw = 100;
 }
 
 Rule rule = Rule();
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 3a147891..708a0a9b 100644
--- a/src/ui/flutter_app/lib/widgets/rule_settings_page.dart
+++ b/src/ui/flutter_app/lib/widgets/rule_settings_page.dart
@@ -247,7 +247,7 @@ class _RuleSettingsPageState extends State<RuleSettingsPage> {
 
       setState(() {
         rule.maxStepsLedToDraw =
-            Config.maxStepsLedToDraw = maxStepsLedToDraw ?? 50;
+            Config.maxStepsLedToDraw = maxStepsLedToDraw ?? 100;
       });
 
       print("[config] rule.maxStepsLedToDraw: ${rule.maxStepsLedToDraw}");
diff --git a/src/ui/qt/game.cpp b/src/ui/qt/game.cpp
index c3baf2a5..27372796 100644
--- a/src/ui/qt/game.cpp
+++ b/src/ui/qt/game.cpp
@@ -65,7 +65,7 @@ Game::Game(
     timeID(0),
     ruleIndex(-1),
     timeLimit(gameOptions.getMoveTime()),
-    stepsLimit(50)
+    stepsLimit(100)
 {
     // The background has been added to the style sheet of view, but not to scene
     // The difference is that the background in view does not change with the view transformation, 
@@ -369,8 +369,12 @@ void Game::setInvert(bool arg)
     }
 }
 
-void Game::setRule(int ruleNo, int stepLimited /*= -1*/, int timeLimited /*= 0*/)
+void Game::setRule(int ruleNo, int stepLimited /*= -1*/, int timeLimited /*= 0 TODO: Unused */)
 {
+    rule.maxStepsLedToDraw = stepLimited;
+
+    // TODO
+    
     // Update the rule, the original time limit and step limit remain unchanged
     if (ruleNo < 0 || ruleNo >= N_RULES)
         return;
diff --git a/src/ui/qt/gamewindow.cpp b/src/ui/qt/gamewindow.cpp
index 30c4a1ef..4a44c81f 100644
--- a/src/ui/qt/gamewindow.cpp
+++ b/src/ui/qt/gamewindow.cpp
@@ -507,11 +507,13 @@ void MillGameWindow::on_actionLimited_T_triggered()
 
     label_step->setText(tr("N-Move Rule:"));
 
-    // TODO: Implement N Moves Limit
+    // TODO: Save settings
     //comboBox_step->addItem(tr("Infinite"), 0);
+    comboBox_step->addItem(tr("10 Moves"), 10);
+    comboBox_step->addItem(tr("30 Moves"), 30);
     comboBox_step->addItem(tr("50 Moves"), 50);
-    //comboBox_step->addItem(tr("100 Moves"), 100);
-    //comboBox_step->addItem(tr("200 Moves"), 200);
+    comboBox_step->addItem(tr("100 Moves"), 100);
+    comboBox_step->addItem(tr("200 Moves"), 200);
     comboBox_step->setCurrentIndex(comboBox_step->findData(gStep));
 
     label_time->setText(tr("Max. time:"));
@@ -541,7 +543,7 @@ void MillGameWindow::on_actionLimited_T_triggered()
         int dStep = comboBox_step->currentData().toInt();
         int dTime = comboBox_time->currentData().toInt();
         if (gStep != dStep || gTime != dTime) {
-            game->setRule(ruleNo, static_cast<int>(dStep), dTime);
+            game->setRule(ruleNo, static_cast<int>(dStep), dTime);  // TODO: Remove dTime
             game->setMoveTime(dTime); 
         }
     }