(;GM[1]FF[4]SZ[19]
GN[a) ko connection]
PC[https://senseis.xmp.net/?IgoHatsuyoRonProblem126/Solution]AP[GoWiki:2009]
DT[2023-02-03]
C[Diagram from https://senseis.xmp.net/?IgoHatsuyoRonProblem126/Solution

a) ko connection]
PL[W]

AB[ra][ob][qb][pc][od][sd][oe][pe][nf][qg][rg][ph][ni][oi][pi][qi]
AW[rb][qc][pd][qd][of][pf][qf][mg][ng][pg][nh][oh][mi][ri][mj][ok][qk][rk]

;W[rd]C[W1]MN[1]
;B[re]C[B2]MN[2]
;W[qe]C[W3]MN[3]
;B[sb]C[B4]MN[4]
;W[rf]C[W5]MN[5]
;B[sf]C[B6]MN[6]

;
)
