(;GM[1]FF[4]SZ[19]
GN[Variation]
PC[https://senseis.xmp.net/?GokyoShumyoSection1Problem30/Solution]AP[GoWiki:2009]
DT[2023-01-18]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection1Problem30/Solution

Variation]
PL[B]

AB[bi][cj][ck][bm][cm][bn]
AW[bh][ch][ci][dj][dk][dl][dm][cn][co][cq]
LB[bj:b][an:a]

;B[cl]C[B1]MN[1]
;W[bo]C[W2]MN[2]
;B[al]C[B3]MN[3]
;W[bk]C[W4]MN[4]

;LB[bj:b][an:a]
)
