(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
GN[ ]PW[ ]PB[Black to play and live]AW[no][oo][po][qo][mp][qp][rp][mq][rq][mr][sr][qs][rs]AB[op][pp][nq][qq][nr][or][pr][qr][rr]FG[259:]PM[2]
(;B[ps]C[Black can try this atari.]
;W[ns]
;B[ss]
;W[rs]
;B[qs]
;W[sq]C[However Black can only make one eye. (White doesn't
need to connect here until after the stone at S1 is retaken)])
(;B[ns]C[This the move that allows Black to live.]
(;W[ps]C[White has to play here; otherwise, it is easy for Black to make a second eye.]
;B[os]
(;W[ss]C[Easy life if White connects.]
;B[sq]
;W[sr]
;B[ss]C[Black does not need to take this stone.])
(;W[sq]
;B[ss]
;W[rs]
;B[qs]C[Also two eyes.]))
(;W[ss]
;B[ps]
;W[sq])))
