Table: fighter_results_50
Columns: res
record
opponent
method
event
round
time
location

Question: How many rounds did Brett go against Kevin Asplund?
SQL: SELECT COUNT("round") FROM fighter_results_50 WHERE "opponent" = 'kevin asplund'

Question: How many rounds did Brett go for the Strikeforce: Shamrock vs. Diaz match?
SQL: SELECT "round" FROM fighter_results_50 WHERE "event" = 'strikeforce: shamrock vs. diaz'