diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
index aed420b..af33b3a 100644
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -546,7 +546,7 @@ void MainWindow::mousePressEvent(QMouseEvent * e)
         }
         else if (this->mRule == GAME_RULE::RENJU)
         {
-            if (!this->m_renju->isIllegal(this->mBoard))
+            if (!this->m_renju->isLegal(this->mBoard))
             {
                 this->OnActionEnd();
                 this->mState = GAME_STATE::OVER;
@@ -1058,7 +1058,7 @@ void MainWindow::OnActionPlayerSetting()
 
 void MainWindow::OnActionVer()
 {
-    const QString strVerNum = "Ver Num: 0.2.01\n";
+    const QString strVerNum = "Ver Num: 0.2.04\n";
     QString strBuildTime = "Build at ";
     strBuildTime.append(__TIMESTAMP__);
     strBuildTime.append("\n");
@@ -1182,7 +1182,7 @@ void MainWindow::OnP1PlaceStone(int x, int y)
         }
         else if (this->mRule == GAME_RULE::RENJU)
         {
-            if (!this->m_renju->isIllegal(this->mBoard))
+            if (!this->m_renju->isLegal(this->mBoard))
             {
                 this->OnActionEnd();
                 this->mState = GAME_STATE::OVER;
@@ -1304,7 +1304,7 @@ void MainWindow::OnP2PlaceStone(int x, int y)
         }
         else if (this->mRule == GAME_RULE::RENJU)
         {
-            if (!this->m_renju->isIllegal(this->mBoard))
+            if (!this->m_renju->isLegal(this->mBoard))
             {
                 this->OnActionEnd();
                 this->mState = GAME_STATE::OVER;
diff --git a/src/renju.cpp b/src/renju.cpp
index f024bcd..726dd35 100644
--- a/src/renju.cpp
+++ b/src/renju.cpp
@@ -511,7 +511,7 @@ bool Renju::isThree(Board *board)
     return false;
 }
 
-bool Renju::isIllegal(Board *board)
+bool Renju::isLegal(Board *board)
 {
     if (board->getVRecord().back().second == STONECOLOR::BLACK)
     {
diff --git a/src/renju.h b/src/renju.h
index bc595bb..e8087d6 100644
--- a/src/renju.h
+++ b/src/renju.h
@@ -64,7 +64,7 @@ class Renju final : public rules
 public:
     bool checkWin(Board *board) override;
     //after checkWin
-    bool isIllegal(Board *board);
+    bool isLegal(Board *board);
     int getRenjuState();
 private:
     bool isOverLine(Board *board);