diff --git a/commondefs.cpp b/commondefs.cpp
index 45f452b6ff2468921aa7482c04cd3f0aa569df7d..e1a3b8d982c64bce9b7554e73d2b66b09121588a 100644
--- a/commondefs.cpp
+++ b/commondefs.cpp
@@ -41,14 +41,14 @@ ChipColor Utils::opponentColorFor(ChipColor color)
 }
 
 
-QString Utils::colorToString(const ChipColor &color)
+QString Utils::colorToString(ChipColor color)
 {
     if (Preferences::useColoredChips())
         return (color == Black ? i18n("Blue") : i18n("Red"));
     return (color == Black ? i18n("Black") : i18n("White"));
 }
 
-QString Utils::moveToString(const KReversiMove& move)
+QString Utils::moveToString(KReversiMove move)
 {
     QString moveString = colorToString(move.color);
 
diff --git a/commondefs.h b/commondefs.h
index b204c474a76ef8eab835a26ffa955498e36c9ed7..941e96abde3b1cfc2946c1939de211e1c2f71bf4 100644
--- a/commondefs.h
+++ b/commondefs.h
@@ -67,7 +67,7 @@ struct KReversiMove: public KReversiPos {
     KReversiMove(ChipColor col = NoColor, int r = -1, int c = -1)
         : KReversiPos(r, c), color(col) { }
 
-    KReversiMove(ChipColor col, const KReversiPos &pos)
+    KReversiMove(ChipColor col, KReversiPos pos)
         : KReversiPos(pos), color(col) { }
 
     ChipColor color;
@@ -109,11 +109,11 @@ ChipColor opponentColorFor(ChipColor color);
 /**
  * @return Human-readable string representing @p color
  */
-QString colorToString(const ChipColor &color);
+QString colorToString(ChipColor color);
 /**
  * @return Human-readable string representing @p move
  */
-QString moveToString(const KReversiMove& move);
+QString moveToString(KReversiMove move);
 /**
  * @return Index of current difficulty level in increasing order
  */
diff --git a/kreversigame.cpp b/kreversigame.cpp
index 9524225a07bf00d9e48bf5100bae6f06427a960d..d009960d0c46787b3de6f266e183615804d3ba19 100644
--- a/kreversigame.cpp
+++ b/kreversigame.cpp
@@ -75,7 +75,7 @@ bool KReversiGame::canUndo() const
     return (m_player[m_curPlayer]->isUndoAllowed() && !m_undoStack.isEmpty());
 }
 
-void KReversiGame::makeMove(const KReversiMove &move)
+void KReversiGame::makeMove(KReversiMove move)
 {
     if (!move.isValid()) {
         kickCurrentPlayer();
@@ -174,7 +174,7 @@ int KReversiGame::undo()
     return movesUndone;
 }
 
-void KReversiGame::turnChips(const KReversiMove &move)
+void KReversiGame::turnChips(KReversiMove move)
 {
     m_changedChips.clear();
 
@@ -198,7 +198,7 @@ void KReversiGame::turnChips(const KReversiMove &move)
     m_undoStack.push(m_changedChips);
 }
 
-bool KReversiGame::isMovePossible(const KReversiMove& move) const
+bool KReversiGame::isMovePossible(KReversiMove move) const
 {
     // first - the trivial case:
     if (m_cells[move.row][move.col] != NoColor || move.color == NoColor)
@@ -211,7 +211,7 @@ bool KReversiGame::isMovePossible(const KReversiMove& move) const
     return false;
 }
 
-bool KReversiGame::hasChunk(int dirNum, const KReversiMove& move) const
+bool KReversiGame::hasChunk(int dirNum, KReversiMove move) const
 {
     // On each step (as we proceed) we must ensure that current chip is of the
     // opponent color.
@@ -367,7 +367,7 @@ int KReversiGame::playerScore(ChipColor player) const
     return m_score[player];
 }
 
-void KReversiGame::setChipColor(const KReversiMove &move)
+void KReversiGame::setChipColor(KReversiMove move)
 {
     // first: if the current cell already contains a chip we remove it
     if (m_cells[move.row][move.col] != NoColor)
diff --git a/kreversigame.h b/kreversigame.h
index 5a80c6c399f66acbf9c7069060ecfa1e4c97e550..4bb6702bf3a16177db4406150b03a4844f4d80cc 100644
--- a/kreversigame.h
+++ b/kreversigame.h
@@ -177,11 +177,11 @@ private:
      *  This will make the player @p move
      *  If that is possible, of course
      */
-    void makeMove(const KReversiMove &move);
+    void makeMove(KReversiMove move);
     /**
      * This function will tell you if the move is possible.
      */
-    bool isMovePossible(const KReversiMove &move) const;
+    bool isMovePossible(KReversiMove move) const;
     /**
      *  Searches for "chunk" in direction @p dirNum for @p move.
      *  As my English-skills are somewhat limited, let me introduce
@@ -191,16 +191,16 @@ private:
      *  CO[O]C <-- this is a chunk
      *  where [O] is one or more opponent's pieces
      */
-    bool hasChunk(int dirNum, const KReversiMove &move) const;
+    bool hasChunk(int dirNum, KReversiMove move) const;
     /**
      *  Performs @p move, i.e. marks all the chips that player wins with
      *  this move with current player color
      */
-    void turnChips(const KReversiMove &move);
+    void turnChips(KReversiMove move);
     /**
      *  Sets the type of chip according to @p move
      */
-    void setChipColor(const KReversiMove &move);
+    void setChipColor(KReversiMove move);
     /**
      *  Delay time
      */
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 96b8c5867c9c905440a2bba0f3211871bca96d76..819956c8c747fa7446437bed7bd2c543c96e6685 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -41,10 +41,6 @@
 #include "kreversicomputerplayer.h"
 #include "kexthighscore.h"
 
-static const int BLACK_STATUSBAR_ID = 1;
-static const int WHITE_STATUSBAR_ID = 2;
-static const int COMMON_STATUSBAR_ID = 0;
-
 KReversiMainWindow::KReversiMainWindow(QWidget* parent, bool startDemo)
     : KXmlGuiWindow(parent),
     m_startDialog(nullptr),