diff --git a/src/position.cpp b/src/position.cpp
index c9244bd8..6f9f0588 100644
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -660,14 +660,14 @@ out:
     return true;
 }
 
-bool Position::_placePiece(File file, Rank rank)
+bool Position::place_piece(File file, Rank rank)
 {
     Square s = Position::polar_to_square(file, rank);
 
     return place_piece(s, true);
 }
 
-bool Position::_removePiece(File file, Rank rank)
+bool Position::remove_piece(File file, Rank rank)
 {
     Square s = Position::polar_to_square(file, rank);
 
@@ -802,7 +802,7 @@ bool Position::select_piece(Square s)
     return false;
 }
 
-bool Position::_selectPiece(File file, Rank rank)
+bool Position::select_piece(File file, Rank rank)
 {
     return select_piece(Position::polar_to_square(file, rank));
 }
@@ -865,8 +865,8 @@ bool Position::command(const char *cmd)
                 tm = mm * 60 + ss;
         }
 
-        if (_selectPiece(file1, rank1)) {
-            return _placePiece(file2, rank2);
+        if (select_piece(file1, rank1)) {
+            return place_piece(file2, rank2);
         }
 
         return false;
@@ -878,7 +878,7 @@ bool Position::command(const char *cmd)
             if (mm >= 0 && ss >= 0)
                 tm = mm * 60 + ss;
         }
-        return _removePiece(file1, rank1);
+        return remove_piece(file1, rank1);
     }
 
     args = sscanf(cmd, "(%1u,%1u) %2u:%2u", &file1, &rank1, &mm, &ss);
@@ -887,7 +887,7 @@ bool Position::command(const char *cmd)
             if (mm >= 0 && ss >= 0)
                 tm = mm * 60 + ss;
         }
-        return _placePiece(file1, rank1);
+        return place_piece(file1, rank1);
     }
 
     args = sscanf(cmd, "Player%1u give up!", &t);
diff --git a/src/position.h b/src/position.h
index d7b9d125..a6776719 100644
--- a/src/position.h
+++ b/src/position.h
@@ -83,12 +83,12 @@ public:
 
     // Properties of moves
     bool select_piece(Square s);
+    bool select_piece(File file, Rank rank);
     bool place_piece(Square s, bool updateCmdlist = false);
+    bool place_piece(File file, Rank rank);
     bool remove_piece(Square s, bool updateCmdlist = false);
+    bool remove_piece(File file, Rank rank);
     bool move_piece(Square from, Square to);
-    bool _selectPiece(File file, Rank rank);
-    bool _placePiece(File file, Rank rank);
-    bool _removePiece(File file, Rank rank);
 
     // Doing and undoing moves
     bool do_move(Move m);
diff --git a/src/ui/qt/gamecontroller.cpp b/src/ui/qt/gamecontroller.cpp
index 18d9d12e..411ebc9f 100644
--- a/src/ui/qt/gamecontroller.cpp
+++ b/src/ui/qt/gamecontroller.cpp
@@ -783,7 +783,7 @@ bool GameController::actionPiece(QPointF pos)
 
     switch (position.get_action()) {
     case ACTION_PLACE:
-        if (position._placePiece(file, rank)) {
+        if (position.place_piece(file, rank)) {
             if (position.get_action() == ACTION_REMOVE) {
                 // 播放成三音效
                 playSound(GAME_SOUND_MILL, position.side_to_move());
@@ -802,7 +802,7 @@ bool GameController::actionPiece(QPointF pos)
         piece = qgraphicsitem_cast<PieceItem *>(item);
         if (!piece)
             break;
-        if (position._selectPiece(file, rank)) {
+        if (position.select_piece(file, rank)) {
             // 播放选子音效
             playSound(GAME_SOUND_SELECT, position.side_to_move());
             result = true;
@@ -813,7 +813,7 @@ bool GameController::actionPiece(QPointF pos)
         break;
 
     case ACTION_REMOVE:
-        if (position._removePiece(file, rank)) {
+        if (position.remove_piece(file, rank)) {
             // 播放音效
             playSound(GAME_SOUND_REMOVE, position.side_to_move());
             result = true;