(;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])))