(;AP[HexGui:0.10.GIT]
C[2022/11/25

Black\: Peter
White\: Frank

White wins.
]FF[4]GM[11]
SZ[11];B[c10];W[d3];B[c3];W[c4];B[g5];W[h4];B[i5];W[h9];B[i9];W[i8];
B[f7];W[g4];B[j3];W[j4];B[i4];W[j2];B[i3];W[d8](;B[f6]
C[Mohex\: Losing move. f3 was winning, see next variation.];W[e9];B[f9];
W[g7];B[h6];W[f8];B[j6];W[f10]
C[Peter\: Normally, I thought that the triangle f9-f11-c11, together with the escape at c10, does not have any useful intrusions. But the present situation is clearly a counterexample, since this move is winning for White.

Indeed, this is a kind of foiling move, since the "connection up" from f9 requires g9.]
;B[k7];W[j8];B[k8];W[j9];B[k9];W[j11];B[j10];W[i11];B[i10];W[h11];B[g10]
;W[h10];B[h8];W[g9];B[resign])(;B[f3];W[e9];B[f9];W[f8];B[g8];W[h6];
B[j6];W[f10];B[e10];W[h7];B[k7];W[j10];B[j9];W[h11];B[h10];W[g11];B[g10]
;W[f11];B[g9]))
