(;GM[1]FF[4]SZ[19]
GN[Main line]
PC[http://senseis.xmp.net/?GokyoShumyoSection1Problem57/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection1Problem57/Solution

Main line]
PL[W]

AB[pb][ic][jc][oc][qc][ld][nd][le][me]
AW[kb][lb][ob][mc][md]
CR[la]
LB[oa:b][nb:a]

;W[nc]C[W1]MN[1]
;B[od]C[B2]MN[2]
;W[ma]C[W3]MN[3]

;CR[la]
LB[oa:b][nb:a]
)
