(;GM[1]FF[4]SZ[17:19]
GN[White makes a ko]
PC[http://senseis.xmp.net/?PickyEndgameProblem/Discussion]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?PickyEndgameProblem/Discussion

White makes a ko]
PL[W]

AB[no][oo][po][qo][bp][cp][dp][ep][qp][cq][eq][pq][qq][br][er][or][cs][es]
AW[ao][bo][co][do][ap][mp][np][op][pp][aq][bq][mq][oq][cr][mr][pr][ms][ps]

;W[bs]C[W1]MN[1]
;B[dr]C[B2]MN[2]
;W[ar]C[W3]MN[3]
;B[as]C[B4]MN[4]

;
)
