Mmmmmm... Indeed. Missing Kc5 on 10 wasn't fatal. There was still a chance for it later.
Rook vs Bishop and Knight
Better would have been 3. Ra3!, which would have resulted in a draw (had you both played without blunders).
Again, the diagram to the left, with obvious variations available but similar in opportunity and position, demonstrates how your move should have resulted in your checkmate.
Was played out to a win (Black missed a drawing opportunity.) But I would like a closer look at this to see if either side (mostly black) had winning chances they missed.