Black 1 is heavy, bad.
This black 1 is good.
This result good result for black. Black feels very comfortable.
This result, upper right side is very large.
In addition, black group was completely caught.
It can still be worth using.
The result is that this can work with each other mutually.
White 1 is very important spot.
This movement is bad.
It had rather not be.
Because black is a bad move, white can live with A, white can invade with B.