Sudoku Friendship !

Few years back, I attended this coding classes in summer holidays. The tutor was a nice sweet lady (just a few years older than me, though!). I used to stay back for lunch and I always had lunch with her and other staff members.
One day, she was busily solving this Sudoku puzzle in a newspaper. Puzzles draw my attention very fast and I always like to solve them. So, I asked her what are the rules and how to play.
She started teaching me everything and all the tricks she knew. And I started playing along with her and we eventually started competing with each other.
Every now and then we used to compete with each other and we almost forgot that we are teacher and students. Unknowingly Sudoku united us and our friendship grew day by day. We used to bet and I won all of 'em. She was like I taught you how to play and you are dominating me ??? But she was really cool and still my good friend.