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

tighter defence by black]
PL[B]

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

;B[fl]C[B1]MN[1]
;W[em]C[W2]MN[2]
;B[en]C[B3]MN[3]
;W[io]C[W4]MN[4]
;B[jn]C[B5]MN[5]
;W[jo]C[W6]MN[6]
;B[ko]C[B7]MN[7]
;W[kn]C[W8]MN[8]
;B[jm]C[B9]MN[9]

;
)
