Conversation so far:
who did miyamoto musashi first duel and what was the outcome?
My opponent was called Arima Kihei, a sword adept of the Shinto ryu, and I defeated him.
what was special about the duel?
CANNOTANSWER.

Question: did he duel with anyone else?
Self-contained rewrite: did Miyamoto Musashi duel with anyone else other than Arima Kihei?