(;GM[1]FF[4]SZ[19]
GN[Black cannot avoid ko]
PC[http://senseis.xmp.net/?12PointProblem2/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?12PointProblem2/Solution

Black cannot avoid ko]
PL[W]

AB[qb][nc][qc][rc][od][pd]
AW[pb][pc][qd][rd][qe]

;W[sc]C[W1]MN[1]
;B[qa]C[B2]MN[2]
;W[ra]C[W3]MN[3]
;B[sb]C[B4]MN[4]
;W[sd]C[W5]MN[5]

;
)
