(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PW[White]PB[Black]AW[pp][qp][rp][nq][oq][nr]AB[pq][qq][or][rr][ps]C[White to kill.]PL[W]
(;W[ns]CR[ns]
(;B[qs]CR[qs]
;W[rq]CR[rq]
;B[sr]CR[sr]
;W[pr]LB[rq:3][pr:5][sr:4][ns:1][qs:2]C[black can not make a second eye.])
(;B[rq]CR[rq]C[variation.]
;W[sq]CR[sq]
;B[sr]CR[sr]
;W[rs]CR[rs]
;B[qs]CR[qs]
;W[pr]CR[pr]C[shortage of liberties.]))
(;W[qs]CR[qs]C[not good.]
;B[rs]CR[rs]
;W[sr]CR[sr]
;B[rq]CR[rq]
;W[sq]CR[sq]
;B[qr]CR[qr]C[black lives.])
(;W[sr]CR[sr]C[not good.]
;B[qr]CR[qr]
;W[rs]CR[rs]
;B[sq]CR[sq]
;W[rq]CR[rq]
;B[ss]CR[ss]C[only ko.]))