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

Black\: Thomas
White\: Jack

No handicap.

Black wins.
]PL[B]
;B[a3]
;W[swap-pieces]
;B[g5]
;W[e7]
;B[i8]
;W[i9]
;B[h9]
;W[g6]
;B[i5]
;W[i6]
;B[h6]
;W[h7]
;B[g7]
;W[f9]
;B[e10]
;W[e8]
(;B[g8]C[Eric\: Better J5, see next variation.]
 ;W[i4]
 ;B[f6]C[Eric\: Good]
 ;W[h3]C[Eric\: Good]
 ;B[i3]
 ;W[h4]C[Eric\:

Instead, White can foil at i2.

https\://www.hexwiki.net/index.php/Foiling]
 ;B[j3]
 (;W[j4]C[Eric\:

This move leaves Black with a ladder escape, so Black wins.

Instead, White should have foiled at i2. See next variation.]
  ;B[f4]
  ;W[resign])
 (;W[i2]C[Eric\:

White must foil.

https\://www.hexwiki.net/index.php/Foiling]
  ;B[f4]
  ;W[f3]
  ;B[g3]
  ;W[h1]
  ;B[g2]
  ;W[g1]
  ;B[f2]
  ;W[f1]
  ;B[d2]
  ;W[e2]
  ;B[d3]
  ;W[e3]
  ;B[d4]
  ;W[e4]
  ;B[d5]
  ;W[e5]
  ;B[d6]
  ;W[e6]
  (;B[b9]C[Jack\: Losing. See next variation for a winning move.]
   ;W[c7]
   ;B[d7]
   ;W[c9])
  (;B[d8]C[Jack\: Winning move for  Black.]
   ;W[d7]
   ;B[b8]
   ;W[b10]
   ;B[c9])))
(;B[j5]C[Eric\:

I initially missed this, but it's a much better way for Black to connect (Black will get G8 or J6), since it blocks potential ladders from the K1 corner along the K-edge.]))
