(;GM[1]FF[4]SZ[19]
GN[Main Line: Ko (W11 at ''a'')]
PC[https://senseis.xmp.net/?GokyoShumyoSection7Problem12/Solution]AP[GoWiki:2009]
DT[2023-01-25]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection7Problem12/Solution

Main Line: Ko (W11 at ''a'')]
PL[W]

AB[ib][nb][ob][hc][mc][nc][kd][he][ke][me][kf][hg][mg][og][ih][ji][mi][kj][lj][oj][nk]
AW[lb][mb][pb][jc][kc][lc][oc][pc][jd][je][oe][jf][pf][jg][kg][pg][oh][ph][ki]
LB[ni:a]

;W[mh]C[W1]MN[1]
;B[nh]C[B2]MN[2]
;W[mf]C[W3]MN[3]
;B[nf]C[B4]MN[4]
;W[ne]C[W5]MN[5]
;B[ld]C[B6]MN[6]
;W[lf]C[W7]MN[7]
;B[lg]C[B8]MN[8]
;W[lh]C[W9]MN[9]
;B[le]C[B10]MN[10]

;LB[ni:a]
)
