(;GM[1]FF[4]SZ[19]
GN[Refutation? or big ko?]
PC[http://senseis.xmp.net/?GokyoSeimyoVolume3Problem13/Attempts]AP[GoWiki:2009]
DT[2009-10-07]
C[Diagram from http://senseis.xmp.net/?GokyoSeimyoVolume3Problem13/Attempts

Refutation? or big ko?]
PL[W]

AB[jb][kb][mb][rb][sb][ic][jc][lc][mc][pc][qc][nd][od]
AW[lb][kc][rc][sc][jd][kd][ld][md][pd][qd][sd][ne][oe][re]

;W[oc]C[W1]MN[1]
;B[nc]C[B2]MN[2]
;W[ob]C[W3]MN[3]
;B[qa]C[B4]MN[4]
;W[na]C[W5]MN[5]
;B[la]C[B6]MN[6]
;W[qb]C[W7]MN[7]
;B[pb]C[B8]MN[8]
;W[pa]C[W9]MN[9]
;B[oa]C[B10]MN[10]

;
)
