(;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]))