Luck? or strength?

Greetings. I played a game against a 8 kyu yesterday, before going to sleep. To my surprise, I won the game. Even though my opponent resigned, calculation wise, I won by 106.5 moku. That's so big, I can't even believe it! I studied the game a few times, to locate my opponents mistakes, and indeed he made some. But I was also astonished by my game play. It was brilliant game play, and it has been quite some time since I last played an excellent game. =)