(;AP[HexGui:0.10.GIT]
C[2020/09/15

Black\: Peter
White\: Bian

Black wins.
]FF[4]GM[11]SZ[11]
;B[a6];W[swap-pieces];B[h3];W[f6];B[c8];W[d7];B[h6];W[h5];B[j4];W[i5];
B[g6];W[g5];B[j5];W[j3];B[i4];W[i2];B[i3];W[i6];B[e7];W[j6];B[e6];W[f4];
B[e4];W[e5];B[c6](;W[d5]
C[Perhaps White could have benefited from not pushing the ladder? See next variations.]
;B[c5](;W[d4];B[c4];W[d1];B[b2];W[c3];B[d3];W[e1];B[f2];W[c9];B[d8];
W[d9];B[f8];W[f9];B[b10];W[b9];B[e9];W[d11];B[d10];W[resign])(;W[d2]
C[d2 variation\: winning for Black.];B[c4];W[b3];B[e2];W[f2];B[d3];W[e1]
;B[f3];W[g2];B[g3]))(;W[d3]C[d3 variation.](;B[d4]
C[Black's first instinct would have been to foil here. However, this is losing.

See the next variation for a winning move suggested by Mohex.]
;W[g2]
C[This is winning for White because the 6x6-triangle in the a1-corner is a 3rd row ladder generation template, which allows White to escape.]
;B[f2];W[g1];B[f3];W[g3];B[d2];W[e2];B[b4];W[c5];B[a6];W[b6];B[a7];W[b7]
C[Note\: d7 is now connected to White's group by double threat.];B[a8];
W[b8];B[a9];W[b10];B[b9];W[d9];B[d8];W[f8];B[f7];W[h7])(;B[c2]
C[Winning move suggested by Mohex.];W[g2];B[c5];W[b4];B[f2];W[g1];B[e2])
)(;W[d2]C[d2 variation.];B[c4];W[d5];B[c5];W[c2];B[e2];W[d3];B[d4];W[f2]
;B[e3];W[e1];B[f3];W[g2];B[g3]))
