(;GM[1]FF[4]SZ[19]
GN[One continuation]
PC[https://senseis.xmp.net/?GokyoShumyoSection1Problem37/Solution]AP[GoWiki:2009]
DT[2022-03-09]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection1Problem37/Solution

One continuation]
PL[B]

AB[jb][ob][pb][qb][ic][jc][nc][qc][pd][ie][je][pe][kf][mf][of]
AW[oa][kb][nb][kc][oc][pc][ld][md][nd][od]
LB[lb:a]

;B[mb]C[B1]MN[1]
;W[mc]C[W2]MN[2]
;B[ma]C[B3]MN[3]
;W[la]C[W4]MN[4]

;LB[lb:a]
)
