(;GM[1]FF[4]SZ[19]
GN[Challenge to a ko]
PC[http://senseis.xmp.net/?BSR2003W100Discussion]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BSR2003W100Discussion

Challenge to a ko]
PL[W]

AB[da][eb][bc][cc][dc][oc][bd][ed][od][qd][ef][qf][rf][dg][fg][pg][eh][bi][ci][di][ei][ji][ki][fj][gj][jj][hk][ik][jk][il][dm][cn][en][do][eo][fo][bp][gp][hp][op][rp][hq][jq][pq][ir]
AW[fb][ec][fc][nc][cd][dd][nd][be][ee][fe][je][ne][df][pf][cg][gg][qg][ch][fh][hh][fi][gi][ii][li][qi][cj][hj][kj][lj][gk][hl][kl][pl][fn][nn][co][go][qo][dp][ep][fp][eq][gq][fr][hr][fs][hs]
CR[qg]
LB[kh:b][oh:a]

;W[of]C[W1]MN[1]
;B[qh]C[B2]MN[2]
;W[ph]C[W3]MN[3]
;B[rg]C[B4]MN[4]
;W[og]C[W5]MN[5]

;CR[qg]
LB[kh:b][oh:a]
)
