(;AP[HexGui:0.10.GIT]
C[2021/03/12

Black\: Frank
White\: Peter

Black wins.
]FF[4]GM[11]PL[B]
SZ[11];B[a3];W[h9];B[d8];W[d7];B[f6];W[e9];B[c8];W[d6];B[c5];W[c9];
B[b10]
C[Eric\:

I don't know if it actually matters here, considering D6 and C5, but in general, Black should reconnect at D9.]
(;W[d10];B[b9]
C[Eric\:

We're back to if Black had answered C9 correctly.];W[e3](;
B[b4];W[b7];B[e7]C[Eric\: f7 capture-dominates this.];W[f3];B[e4];W[f5];
B[g5];W[h2];B[h3];W[g4];B[h4];W[i2];B[g3];W[g2];B[f4];W[d4];B[d5];W[c4];
B[b5];W[c1];B[a2];W[resign])(;B[d4]))(;W[b9]
C[Eric\:

Considering E6 and D5, I actually agree with White playing D10 anyway, but in general, this is how White can exploit Black's error.]
;B[d9];W[d10];B[c10]
C[Eric\:

If Black reconnects, then White gets both sides, rather than just D10.]
))
