He made a huge framework (ippoji?) and he left there a lot of holes and a weak group in lower right side. He made a very bad exchange in upper right corner. Ok, these are rather easy mistakes/faults to notice. But more subtle things are out of my sight and I will appreciate any stronger player's insights and suggestions on how black could and should made white's life harder than in the game.
Please remember that the game is yet to be finished, so I would like to ask you to avoid any hints that could influence current board situation. Give me a chance to lose a won game
Thanks