(;AP[HexGui:0.10.GIT]
C[2021/09/03

Black\: Marietje
White\: Frank

Handicap\: 1

White wins.
]
FF[4]GM[11]PL[B]SZ[11];B[a3];B[h7];W[h9];B[g9]
C[Eric\:

White still has a height-3 escape here, which is too good for White, since it's Black who spent a net move here.  Black should play i9 or j9 instead of g9.  https\://www.hexwiki.net/index.php/Joseki#5th_row_josekis]
;W[e4];B[f4];W[f6];B[h5];W[h6];B[g6];W[g7];B[f7];W[e9]
C[Peter\: Losing. Maybe f8 was better?

Eric\: Yes, f8 was better.];
B[f8];W[f9];B[i9]C[Eric\:

Surely g8 is better.];W[h10]
C[Eric\:

Now White could have played g8 instead.](;B[d9]
C[Eric\: 

better d8, see next variation.];W[d10];B[j5];W[f11];B[i10];
W[i8]
C[Eric\:

It turns out that this corner is now settled, as D10+E9 connects to the K-edge and J5 connects to H5, since with these surroundings, J5 connecting to the 11-edge is never worse for Black.]
;B[k7]
C[Eric\:

From a more-local perspective, due to h7, Black's move in the i8 ziggurat should've been j6.]
;W[j6]
C[Eric\:

Now White has that whole ziggurat.  As a result, H6 is also connected the the K-edge, so the K7-for-J6 exchange lost a semi-connection from J5 to H5.

(Black went from a connection to a semi-connection.)]
;B[c10]
C[Eric\:

I did not see the problem before I advanced several moves ahead, but in hindsight, maybe B10 instead of this.

(If the same next several moves were played, then Black could play   32. B7  .)]
;W[e8];B[d8];W[e7];B[c7];W[d7];B[c8]
C[Eric\: if Black had played b10 instead of c10 earlier, then Black could now have played b7.]
;W[d5];B[d6];W[e5];B[b6];W[b5];B[c5];W[d3];B[c4];W[c2];B[b3];W[b1];
B[resign])(;B[d8]
C[Eric\:

This connects to the 11-edge, while also helping towards the 1-edge.]
;W[c10];B[d10];W[d9];B[g8]))
