user: Question: When did the opponent Knockout Barry Prior in more than 2 rounds?
Columns: ['Date', 'Result', 'Opponent', 'Method', 'Round']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['20 November 2011', 'Win', 'Dominique Alexander', 'Knockout', 4.0]
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Method" = 'Knockout' AND "Round" > 2.0 AND "Opponent" = 'Barry Prior';