(;GM[1]FF[4]SZ[19]
GN[double Ko]
PC[http://senseis.xmp.net/?RTGProblem20/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?RTGProblem20/Attempts

double Ko]
PL[W]

AB[oa][qa][ob][pb][nc][pc][sc][nd][od][pd][qd][rd]
AW[mb][nb][mc][md][sd][ne][oe][pe][qe][re][se]

;W[rc]C[W1]MN[1]
;B[rb]C[B2]MN[2]
;W[sb]C[W3]MN[3]
;B[qc]C[B4]MN[4]
;W[ra]C[W5]MN[5]
;B[sa]C[B6]MN[6]

;
)
