Conversation so far:
What is the Pistons roadblock referring to in Michael Jordan's NBA career?
Known as the period from 1987 to 1990 where the Bulls lost to the Pistons for the third consecutive season.
What year did the Bulls lose to the Pistons for the third consecutive season?
1990

Question: Who was their coach at the time?
Self-contained rewrite: Who was the Chicago Bulls' coach in 1990?