(;AP[HexGui:0.10.GIT]
C[2021/04/30

Black\: Bian
White\: Frank

Black wins.
]FF[4]GM[11]PL[B]
SZ[11];B[a2];W[f6];B[i4];W[g7];B[h7];W[h6];B[j5];W[i3];B[h4];W[j4];B[i5]
;W[i8];B[j6];W[g9];B[j9]C[Eric\: good];W[k7];B[d8];W[e8];B[e6];W[c10];
B[d9];W[d10];B[f9];W[e9];B[g8];W[h3](;B[f5]
C[Eric\:

What Black played might be more efficient, but I'm not quite sure it wins.  I can prove that G4 wins, see next variation.]
;W[f3];B[f4];W[f2];B[g3];W[h1];B[h2];W[i1];B[j2];W[resign])(;B[g4];W[g3]
C[Eric\:

If White doesn't just push, then Black gets a lower ladder, and A2 escapes such ladders.]
;B[f4]C[Eric\:

This connects Black to E6 and D8.];W[f3];B[d4];W[e4];
B[c6];W[d6];B[b8];W[c8];B[b9]))
