The mystery of 13x13 Volume 1

What is the purpose of white 1 ?

White 1 is to prevent black 2 hane.

Black 2 could only jump to advance, then white 3 bend, it is the key moment. How could black manage both the corner and the stones on the edge?

Failure： In the real game, black 1, 3 tried to strengthen the corner, but after white 4 advanced, both the corner nor the stones on the edge are settled. Black is in a disadvantage.

Black 1 jump is a tesuji, black can capture the three white stones, but after white sarcrifice...

White is winning!

Black 1 is the solution, if white 2 jump, black 3 hane is successful.

If white 2 save the three stones, black 3 hane could demobilize the white stones on the left! Black succeess!