(;GM[1]FF[4]SZ[19]
GN[Main line]
PC[http://senseis.xmp.net/?GokyoShumyoSection1Problem37/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection1Problem37/Solution

Main line]
PL[W]

AB[jb][ob][pb][ic][jc][nc][qc][pd][ie][je][pe][kf][mf][of]
AW[nb][kc][oc][pc][ld][md][nd][od]

;W[oa]C[W1]MN[1]
;B[qb]C[B2]MN[2]
;W[kb]C[W3]MN[3]

;
)
