Table: mma_fights_6
Columns: res
record
opponent
method
event
round
time
location

Question: Which Opponent has Location Wonju Chiak Indoor Gym, South Korea?
SQL: SELECT "opponent" FROM mma_fights_6 WHERE "location" = 'wonju chiak indoor gym, south korea'

Question: Which is the lowest Round with the Opponent, Paul Cahoon and Location, Amsterdam, Netherlands?
SQL: SELECT MIN("round") FROM mma_fights_6 WHERE "opponent" = 'paul cahoon' AND "location" = 'amsterdam, netherlands'

Question: Which Event has the Opponent, Bernard Ackah?
SQL: SELECT "event" FROM mma_fights_6 WHERE "opponent" = 'bernard ackah'