Table: fighter_results_39
Columns: res
record
opponent
method
event
round

Question: What event had a win, record of 8-1 and n/a round?
SQL: SELECT "event" FROM fighter_results_39 WHERE "res" = 'win' AND "round" = 'n/a' AND "record" = '8-1'

Question: What event was the opponent Karl Knothe and had a submission (rear naked choke)?
SQL: SELECT "event" FROM fighter_results_39 WHERE "method" = 'submission (rear naked choke)' AND "opponent" = 'karl knothe'

Question: What's the record for the match when the res was a win and the method was a decision?
SQL: SELECT "record" FROM fighter_results_39 WHERE "method" = 'decision' AND "res" = 'win'

Question: What round had a record of 4-1?
SQL: SELECT "round" FROM fighter_results_39 WHERE "record" = '4-1'

Question: What's the record of the UCS 2 - Battle at the Barn when the round was n/a?
SQL: SELECT "record" FROM fighter_results_39 WHERE "round" = 'n/a' AND "event" = 'ucs 2 - battle at the barn'

Question: What round had a record of 8-2?
SQL: SELECT "round" FROM fighter_results_39 WHERE "record" = '8-2'