Roberts vs Casey 6-13

Moves 6  

White answers at . He is rightly assuming, that this hits a weak spot, but is too hasty. The game has a theme now: Will Black find a good moment to cut at a?

First chance  

To begin with, he could cut immediately. White is separated into 3 stones whereas black is at least loosely connected to one group. This looks fine to me!

Alternative  

After White might even turn back to defend at . provides some aji to be used later.

The reader might consider the cut /defense at (a in the initial diagram) for any of the next moves himself!

Moves 6-10  

Just a word about : , and are setting up a staircase. Useful ideas might be found there, if Black wants to answer locally. is a One-Two-Three error: forcing his opponent to a necessary move.

Moves 11-13  

With (move 13) the game comes to a pause: White has successfully invaded in sente. He can now defend at a and the game would be almost over.