(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2] RU[Japanese]SZ[19]KM[6.50] AW[bn][ao][bo][ap][cp][cq][dq][eq][er][bs][ds]AB[am][bm][cm][an][cn][co][dp][ep][fp][bq][fq][fr][es][fs]C[Black's move, your task is to kill the group of whites in the corner] (;B[cr] ;W[br] (;B[aq] ;W[ar] (;B[bp] ;W[cs] ;B[dr]C[Excellent! RIGHT]) (;B[dr] ;W[bp]) (;B[cs] ;W[bp])) (;B[ar] ;W[bp]) (;B[bp] ;W[aq])) (;B[br] ;W[cr] (;B[bp] ;W[ar] ;B[aq] ;W[bo] (;B[ao] ;W[ap]) (;B[bn] ;W[ap]) (;B[ap] ;W[ao]) (;B[as]C[It is only ko])) (;B[ar] ;W[bp]) (;B[aq] ;W[bp]) (;B[as] ;W[ar])) (;B[aq] ;W[cr] (;B[bp] ;W[br]) (;B[br] ;W[bp])) (;B[bp] ;W[br] (;B[aq] ;W[cr]) (;B[cr] ;W[aq])) (;B[ar] ;W[br] (;B[aq] ;W[bp] ;B[cr] ;W[as]) (;B[cr] ;W[bp])))