public class Chessboard
{
  public static void main(String args[]){
    char[][] board;
    
    // Every position on the board
    //  - either contains " " if there is nothing there
    //  - contains an alphabet signifying the piece present

    // indexing convention [row][column]    
    board = new char[8][8];
    
    // initialize an empty chessboard
    for(int row = 0; row < 8; row++)
      for(int col = 0; col < 8; col++)
        board[row][col] = ' ';
    
    board[0][0] = 'r';  // rook
    board[0][1] = 'h';  // knight / horse
    board[0][2] = 'b';  // bishop
    board[0][3] = 'q';  // queen
    board[0][4] = 'k';  // king
    board[0][5] = 'b';  // bishop 2
    board[0][6] = 'h';  // knight / horse 2
    board[0][7] = 'r';  // rook 2
    
    for(int i = 0; i < 8; i++){
      board[1][i] = 'p';  // pawn
      board[6][i] = 'P';
    }
    
    board[7][0] = 'R';  // rook
    board[7][1] = 'H';  // knight / horse
    board[7][2] = 'B';  // bishop
    board[7][3] = 'Q';  // queen
    board[7][4] = 'K';  // king
    board[7][5] = 'B';  // bishop 2
    board[7][6] = 'H';  // knight / horse 2
    board[7][7] = 'R';  // rook 2
    
    printChessboard(board);
    
    movePiece(board, 6, 1, 5, 1);
    printChessboard(board);
    
    movePiece(board, 1, 6, 2, 6);
    printChessboard(board);
  }
  
  static void printChessboard(char[][] chessboard){
    System.out.println("---------------");
    for(int row = 0; row < 8; row++){
      for(int col = 0; col < 8; col++){
        System.out.print(chessboard[row][col]);
        System.out.print(' ');
      }
      System.out.println("");
    }
  }
  
  static void movePiece(char[][] chessboard, int from_row, int from_col, int to_row, int to_col){
    chessboard[to_row][to_col] = chessboard[from_row][from_col];
    // empty the location from where the piece was moved
    chessboard[from_row][from_col] = ' ';
  }
}