(;GM[1]FF[4]SZ[19]
GN[Ko (Black plays)]
PC[http://senseis.xmp.net/?OD1PAug3Problem/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?OD1PAug3Problem/Solution

Ko (Black plays)]
PL[B]

AB[dm][em][dn][go][ho][io][jo][cp][dp][jp][cq][hq][br][cs]
AW[fm][en][fn][hn][in][jn][ko][lo][ep][dq][fq][kq][lq][cr][er]

;B[gr]C[B1]MN[1]
;W[ir]C[W2]MN[2]
;B[es]C[B3]MN[3]
;W[fs]C[W4]MN[4]
;B[fr]C[B5]MN[5]
;W[ds]C[W6]MN[6]
;B[dr]C[B7]MN[7]

;
)
