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_21573 ( "No." real, "Date" text, "Tournament" text, "Winning score" text, "To par" text, "Margin of victory" text, "Runner(s)-up" text, "Winners share ( $ )" real )

### Question ###
How many winning scores were there in the rr donnelley lpga founders cup?

### Accurate SQL ###

SELECT COUNT("Winning score") FROM table_21573 WHERE "Tournament" = 'RR Donnelley LPGA Founders Cup'