(;GM[1]FF[4]SZ[19]
GN[Main line]
PC[http://senseis.xmp.net/?GokyoShumyoSection1Problem22/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection1Problem22/Solution

Main line]
PL[B]

AB[cq][dq][eq][br][fr][bs]
AW[dn][co][bp][dp][ep][bq][fq][gq][ar][gr]
LB[cr:a][er:b]

;B[fs]C[B1]MN[1]
;W[dr]C[W2]MN[2]
;B[ds]C[B3]MN[3]

;LB[cr:a][er:b]
)
