(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PB[Black to live]AW[ln][nn][pn][qo][ro][mp][lq][nq][qq][rq][or][ps][qs]AB[np][op][pq][pr][qr][rr][sr][rs]
(;B[os]C[Taking the two stones like this does not make two eyes for sure.]
;W[ps]
;B[nr]
;W[ns]
;B[mr]
;W[mq]
;B[oq]
;W[lr]C[Black has to fight a ko.])
(;B[mr]C[This play does not make two eyes either.]
;W[nr]
;B[os]
;W[ps]
;B[mo]
;W[lp]
;B[no]C[Black can try to break out.]
;W[mn]
;B[lo]
;W[ko]
;B[kp]
;W[jp]
;B[kq]
;W[jq]
;B[kr]
;W[lr]
;B[ls]
;W[mq]C[But White wins the capturing race.])
(;B[nr]C[This is the correct play.]
;W[mr]
;B[os]C[After this White does not have time to play the throw-in.]
;W[ns]
;B[ps]C[Black lives.]))
