(;AP[HexGui:0.10.GIT]
C[2021/04/23

Black\: Frank
White\: Bian

White wins.
]FF[4]GM[11]PL[B]
SZ[11];B[a3];W[swap-pieces];B[h4];W[g6];B[i4];W[f7];B[e7];W[f5];B[e5];
W[e6];B[c7];W[d6];B[c6];W[e3](;B[c5]
C[Eric\: 

I certainly would not have been able to work this out during a game, and probably wouldn't have tried, but\: 

This is now a forced win for White.

White kept the win for the whole rest of the game.

See next variation for what I think Black should have played.
]
;W[d4];B[h6];W[g8];B[i7];W[h9];B[i9];W[i8];B[k7];W[j7];B[k6];W[j6];B[k5]
;W[j4];B[resign])(;B[d4]C[Eric\: 

I think Black should've played this.]
;W[e2]
C[Eric\:

If White does not respond closer to the A1 corner than this, then Black C5 threatens to connect through the corner, which would mean Black can use D5 _just_ for the bridge from D4 to E5.]
;B[c5];W[f4];B[d2];W[d3];B[b4]))
