(;GM[1]FF[4]SZ[19]
GN[Main line: a ko]
PC[http://senseis.xmp.net/?TsumegoFromGames17/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?TsumegoFromGames17/Solution

Main line: a ko]
PL[B]

AB[co][eo][fo][go][ho][cp][dp][ep][ip][kp][bq][eq][iq][kq][er][ir]
AW[bm][cn][dn][en][fn][gn][hn][bo][do][io][jo][bp][fp][gp][hp][hq][dr][fr][hr][es]

;B[fq]C[B1]MN[1]
;W[cq]C[W2]MN[2]
;B[gr]C[B3]MN[3]
;W[gs]C[W4]MN[4]

;
)
