(;GM[1]FF[4]SZ[19]
GN[Failure]
PC[https://senseis.xmp.net/?IgoHatsuyoRonProblem18/Solution]AP[GoWiki:2009]
DT[2023-01-30]
C[Diagram from https://senseis.xmp.net/?IgoHatsuyoRonProblem18/Solution

Failure]
PL[B]

AB[lc][oc][pc][qc][ld][nd]
AW[rb][ic][jc][mc][rc][hd][kd][pd][qd][le][ne][lf][pf]

;B[md]C[B1]MN[1]
;W[mb]C[W2]MN[2]
;B[lb]C[B3]MN[3]
;W[kb]C[W4]MN[4]
;B[la]C[B5]MN[5]
;W[oa]C[W6]MN[6]

;
)
