(;GM[1]FF[4]SZ[19]
GN[If black defends on the left]
PC[http://senseis.xmp.net/?GokyoShumyoSection1Problem100/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection1Problem100/Attempts

If black defends on the left]
PL[W]

AB[gm][hm][cn][dn][fn][in][co][fo][go][cp][gp][ip][jp][cq][kq][lq][nq][dr][es][fs]
AW[dm][im][gn][hn][do][ho][ep][hp][eq][hq][iq][er][fr][gr][jr]
LB[em:a]

;W[fm]C[W1]MN[1]
;B[en]C[B2]MN[2]
;W[io]C[W3]MN[3]
;B[jn]C[B4]MN[4]
;W[jo]C[W5]MN[5]
;B[ko]C[B6]MN[6]
;W[kn]C[W7]MN[7]
;B[jm]C[B8]MN[8]
;W[il]C[W9]MN[9]

;LB[em:a]
)
