(;AP[Hexon:0.0]FF[4]GM[11]SZ[6]C[2022/11/18

Black\: Eric
White\: Mason

Black wins.
]PL[B]
;B[f4]
;W[swap-pieces]
;B[b3]
(;W[d3]C[Eric\: See next variation for White's only winning move.]
 ;B[c4]
 ;W[b6]
 (;B[c3]C[Eric\: To see why Black had to move here, compare the next variation.]
  ;W[a6]
  ;B[c6]
  ;W[c5]
  ;B[e4]
  ;W[resign])
 (;B[pass]
  ;W[a6]
  ;B[c6]
  ;W[c5]
  ;B[e4]
  ;W[c2]
  ;B[b2]
  ;W[c3]
  ;B[b4]
  ;W[d4]
  ;B[f2]
  ;W[f1]))
(;W[c3]C[Eric\:

This is White's only winning move.]))
