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