(;AP[Hexon:0.0]FF[4]GM[11]SZ[11]C[2022/06/03

Black\: Peter
White\: Bian

Black wins.

Game record reconstructed from intermediate positions and memory. Move order may vary.]PL[B]
;B[b2]
;W[f6]
;B[i8]
;W[f7]
;B[b8]
;W[d5]
;B[e5]
;W[e4]
;B[f4]
;W[d8]
;B[i5]
;W[i6]
;B[j5]
;W[j6]
;B[h6]
;W[g3]
;B[g4]
;W[j2]
;B[h3]
;W[h5]
;B[i4]
(;W[g9]C[Peter\: The question came up how b8 was helpful. See next variation for two possibilities.]
 ;B[h7]
 ;W[resign])
(;W[h7]
 ;B[g7]
 ;W[f9]
 ;B[g8]
 ;W[g9]
 ;B[h8]
 ;W[i9]
 ;B[h9]
 ;W[g11]
 ;B[g10]
 ;W[f11]
 ;B[f10]
 ;W[e11]
 (;B[d10]C[Possibility 1.]
  ;W[e10]
  ;B[e8]
  ;W[f8]
  ;B[d7]
  ;W[e7]
  ;B[a10])
 (;B[e10]C[Possibility 2.]
  ;W[d11]
  ;B[d10]
  ;W[c11]
  ;B[b10]
  ;W[c10]
  ;B[c9]
  ;W[d9]
  ;B[c6]
  ;W[d6]
  ;B[b5])))
