private static Move BackwardRightForBlack(int r, int c, Board board){
        Move backwardRight = null;
        
        assert(board.cell[r][c].equals(CellEntry.blackKing));
        
        if(r<Board.rows-1 && c>=1 &&
           board.cell[r+1][c-1].equals(CellEntry.empty) 
          )
        {
            backwardRight = new Move(r,c, r+1, c-1);
        }
        return backwardRight;
    }