Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_63 ( nationality___opponent VARCHAR, competition VARCHAR, result VARCHAR )

### Question ###
Name the Nationality / Opponent of the Competition of welsh rugby union challenge trophy and a Result of 38-29?

### Accurate SQL ###

SELECT nationality___opponent FROM table_name_63 WHERE competition = "welsh rugby union challenge trophy" AND result = "38-29"