anchor.diff:  }
   
   void handleKeyPress(KeyboardEvent event, GameState gamestate) {
  -  validMoves = [];
  +  selectedPiece = null;
   
     switch (event.keyCode) {
       case 37: //left
  
positive.code: 
  var camera = new Camera();
  Bench bench;
  List<Move> validMoves = [];
  
  
  void main() {
  
negative.code:     return;
    }
    bench = new Bench(parsedGame.player1, parsedGame.player2);
    selectedPiece = null;
    gamestate.initialize(parsedGame.gameEvents);
    gamestate.step(1);
    render(gamestate);
  }
  
  void showNextMove(GameState gamestate) {
    selectedPiece = null;
    gamestate.stepBy(1);
  
    render(gamestate);
  }
  
  void showPreviousMove(GameState gamestate) {
    selectedPiece = null;
    gamestate.stepBy(-1);
  
    render(gamestate);
  }
  
  void showFirstMove(GameState gamestate) {
    selectedPiece = null;
    gamestate.step(1);
  
    render(gamestate);
  }
  
  void showLastMove(GameState gamestate) {
    selectedPiece = null;
    gamestate.stepToEnd();
  
    render(gamestate);
  