(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PW[White]PB[Black to play and kill]AW[qp][sp][pq][qq][sq][pr][rr][qs]AB[qo][ro][op][pp][rp][oq][rq][or][rs]C[At first this looks like two eyes already.]
(;B[so]C[Black can try this atari.]
;W[ss]C[White captures the black stone.]
;B[sr]C[Black captures two stones...]
;W[sq]C[... but White recaptures one stone and makes two eyes.]
;B[os]C[This descent no longer works.]
;W[ps]C[White just connects.])
(;B[sr]C[This throw-in does not help either.]
;W[ss])
(;B[os]C[This descent is the correct play and White is defenceless.
]
(;W[ss]
;B[ps]C[Only one eye.]
;W[qr])
(;W[ps]C[Self-atari!]
;B[qr])))
