(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2] RU[Japanese]SZ[19]KM[0.00]TM[] PW[White]PB[Black]AW[ml][ol][lm][pm][ko][lo][po][qo][jp][mp][op][rp][jq][rq][jr][rr]AB[nm][lp][pp][lq][mq][oq][pq][lr][pr][ls][ps]C[White to play]PL[W] (;W[nr]CR[nr] (;B[oo]CR[oo] (;W[no]CR[no] ;B[ns]CR[ns] ;W[nq]CR[nq] ;B[np]CR[np]C[RIGHT Fighting the ko is the best white can do]) (;W[np]CR[np] ;B[nq]CR[nq] ;W[no]CR[no] ;B[ns]CR[ns]C[Black lives]) (;W[ns]CR[ns] ;B[no]CR[no] ;W[np]CR[np] ;B[mo]CR[mo] ;W[nq]CR[nq] ;B[nn]CR[nn]C[Black wins the semeai])) (;B[np]CR[np]C[Black O4 is a mistake] ;W[no]CR[no]C[White O5 makes the eyes at N4 and P4 false. It cannot be caught.] ;B[oo]CR[oo] ;W[ns]CR[ns] ;B[mo]CR[mo] ;W[nn]CR[nn]C[The O5 stone escapes and later white can make the 'rabbity six' shape to kill black.])) (;W[ns]CR[ns] ;B[nr]CR[nr]))