Table schema:
CREATE TABLE table_name_30 (launch_date VARCHAR, odds_of_winning VARCHAR, top_prize VARCHAR)

Question: What is the launch date odds of winning 1 in 4.23 with a top prize of $15,000?
SQL: SELECT launch_date FROM table_name_30 WHERE odds_of_winning = "1 in 4.23" AND top_prize = "$15,000"