(;GM[1]FF[4]SZ[19]
GN[Main line]
PC[http://senseis.xmp.net/?GokyoShumyoSection1Problem17/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection1Problem17/Solution

Main line]
PL[W]

AB[mc][nc][rc][od][pd][rd][qe]
AW[rb][pc][qc][qd]

;W[sc]C[W1]MN[1]
;B[re]C[B2]MN[2]
;W[qa]C[W3]MN[3]

;
)
