(;AP[Hexon:0.0]FF[4]GM[11]SZ[11]C[2023/10/06

Black\: Bian
White\: Peter

White wins.
]PL[B]
;B[f6]
;W[e5]
;B[h4]
;W[d10]
;B[h8]
;W[h6]
;B[i4]
;W[f7]
;B[i6]
;W[i5]
;B[k4]
;W[f4]
;B[g4]
;W[g3]
;B[j3]
;W[j5]
;B[k5]
;W[j6]
;B[k6]
;W[j7]
;B[k7]
;W[j9]
;B[g7]
;W[g6]
;B[j8]
;W[i9]
;B[i8]
;W[g10]
;B[g9]
;W[e11]
;B[c10]
;W[d9]
;B[c9]
;W[d8]
(;B[c8]C[Peter\: to prevent e5 from escaping a 4th row ladder, b7 is usually one of the possible moves. However, it doesn't work in the presence of f4. See the next variation.]
 ;W[d7]
 ;B[c7]
 ;W[d4]
 ;B[resign])
(;B[b7]
 ;W[c7]
 ;B[a9]C[Peter\: Black plays here, rather than b8, to prevent White from getting c8.]
 ;W[c6]
 ;B[b6]
 ;W[c4]))
