(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
SZ[13]
AW[gj][ck][ek][fk][gk][bl][cl][dl][gl]AB[gi][hi][bj][cj][dj][ej][fj][ij][bk][dk][hk][ik][hl][hm]C[Capture the white group! (directly or in ko)]PL[B]
(;B[em]
(;W[el]
(;B[gm]
;W[fm]
;B[fl]C[Yes, ko is best.
RIGHT])
(;B[fm]
;W[gm]
;B[al]
;W[bm]C[Seki.])
(;B[dm]
;W[fm])
(;B[al]
;W[fm]))
(;W[fm]
(;B[gm]
;W[el]
;B[fl]C[Yes, ko is best.
RIGHT])
(;B[el]
;W[dm])
(;B[al]
;W[el])
(;B[dm]
;W[el])))
(;B[fm]
;W[em]
(;B[gm]
;W[al])
(;B[al]
;W[gm])
(;B[el]
;W[fl]
;B[gm]
;W[al]))
(;B[gm]
;W[em]
(;B[fm]
;W[al])
(;B[al]
;W[fm])
(;B[el]
;W[fm]))
(;B[al]
;W[fm])
(;B[el]
;W[em]
(;B[fm]
;W[fl]
;B[gm]
;W[al])
(;B[gm]
;W[fm])))
