(;AP[HexGui:0.10.GIT]
C[2020/09/04

Black\: Bian
White\: Eric

Handicap\: 0.5

White wins.
]
FF[4]GM[11]SZ[11];B[f6];W[h2];B[f3];W[e2];B[d4]
C[Black allows himself to be undermined, see Section 7.7 of Seymour's book. White will make good use of this in the endgame.]
;W[c3];B[g1];W[e7];B[d7];W[e6];B[f7];W[g8];B[h6];W[i7];B[e9];W[e8];B[f8]
;W[g4];B[i4];W[i3](;B[c6];W[c9]
C[Note that White's g4 is already connected to the a-edge due to undermining. See the second variation on the next move.]
(;B[j5];W[j3];B[b5];W[f5];B[a10];W[b8];B[resign])(;B[f5];W[f4];B[e5];
W[e4];B[e3];W[d5];B[d6];W[c5]))(;B[b8];W[d6];B[c6];W[c7];B[b7];W[b9])(;
B[d6])(;B[b4];W[b3];B[b6]))
