How I hung a Bishop

I under estimate my opponents chances. I thought f5,e4 (not correct position white pawn is on d5) wins the N back. I think of responses to my calculations that are weak. I knew the N was coming to g3, and I completely ignored it.  My ideas "must be right".  These weaknesses often allow me to see the first move of a good combination, but not the follow up moves.

I need to respect my opponents more, I need to calculate better.

"Don't move until you see it."