So here is the position that I took a photo of my phone at the chess club tonight and spent ages on.
The main line is the ACTUAL moves played in the game. Winning the exchange is a mistake for me, although it jumped out for me at first.
The other lines are various variations that I considered at the time, and also for some the computer's top move. After winning the exchange I did not consider Qb4 as a defence.
Interestingly the move Nd6 is not the most important move, it is whether you follow up Qg5+ with Nd6 or go for the exchange.
Anyway be interesting to hear other members views on this. I certainly spent ages thinking about what move to make!