public void new_layout(String b ) {
      System.out.println(b);
      for ( int i = 0; i < BOARD_SIZE; i++ )
        for ( int j = 0; j < BOARD_SIZE; j++ ) {
          if ( b.charAt( i*BOARD_SIZE+j ) == 'b' )
            mBoard[i][j] = BLACK_CHECKER;
          if ( b.charAt( i*BOARD_SIZE+j ) == 'w' )
            mBoard[i][j] = WHITE_CHECKER;
          if ( b.charAt(i*BOARD_SIZE+j) == 'X' )
            mBoard[i][j] = EMPTY_SQUARE;
        }
      refreshDataStructures();
    }