(;AP[HexGui:0.10.GIT]
C[2021/11/05

Black\: Marietje
White\: Frank

Handicap\: 0.5

White wins.]
FF[4]GM[11]PL[B]SZ[11];B[h8];W[h4];B[e5];W[e6];B[g5];W[f8](;B[g7]
C[Eric\:

As Frank pointed out just after the game, F7 (variation) is probably much better, even though White can foil along the 11-edge and Black is not connected to the 1-edge either.]
;W[g9];B[h9];W[g8];B[h7];W[g6];B[i5];W[h3];B[i3];W[j2];B[i2];W[i4];B[h5]
;W[f4];B[g3];W[g4](;B[f5]
C[Eric\:

I wasn't sure when I looked through just after the game, but now, after playing out lines with ghosts, I can prove that White is winning after F5.

Specifically, White can get parallel ladders and push at height 4 to connect to E6, since White has too much room for Black to not push, and that gives White an escape fork at B8 or B9.

Black made the win much easier for White, and White kept it for the rest of the game.

Maybe d6, see next variation?]
;W[e4];B[b5]
C[Eric\:

Playing A5 or C5 instead would've made White's win more complicated.]
;W[d4];B[c3];W[c6];B[resign])(;B[d6]
C[Eric\:


Looking now, this seems good for Black.

White can get a height-3 ladder from the A1 corner, but I don't see that being enough for White.]
))(;B[f7](;W[g9]
C[Eric\:

White can foil,

White can also keep G5 off of the 1-edge, see next variation.]
;B[g7]C[Eric\:

but Black can build a wall];W[h9];B[i8];W[i9];B[j8];
W[j9];B[d9]C[Eric\:

and then play here.])(;W[g4]
C[Eric\:

White can also keep G5 off of the 1-edge,];B[d6]
C[Eric\:

but Black can play here.])))
